[Bug]: Output dialog popup on every button execution

[Levii-L]

✈ Pre-Flight checks

• I don't have SentinelOne antivirus installed (see above for the solution)
• I have searched in the issues (open and closed) but couldn't find a similar issue
• I have searched in the pyRevit Forum for similar issues
• I already followed the installation troubleshooting guide thoroughly
• I am using the latest pyRevit Version

🐞 Describe the bug

Every time I click a pyRevit ribbon button, the output dialog pops up with just the message: &.

Conditions Where This Occurs:

• Python Engine: IronPython 3 (342)
• Revit Version: Revit 2025

Tested Configurations:

• Revit 2023 + IronPython 3 (342) : No issue
• Revit 2025 + IronPython 2 (2712) : No issue
• Revit 2025 + IronPython 3 (342) : Issue occurs — output shows only &

Also a simple script like print("12345") results in only 1 being printed in the output dialog.

⌨ Error/Debug Message

-

♻️ To Reproduce

Use Revit 2025 in combination with Ironpython 3 (342) engine.

⏲️ Expected behavior

No output dialog popup with & on every button press.

🖥️ Hardware and Software Setup (please complete the following information)

==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
master | Branch: "master" | Version: "5.1.0.25094+1131-wip" | Path: "C:\Users\***\AppData\Roaming\pyRevit-Master"
==> Attachments
master | Product: "2025 First Customer Ship" | Engine: IPY342 (342) | Path: "C:\Users\***\AppData\Roaming\pyRevit-Master"
master | Product: "2023.1.3" | Engine: IPY342 (342) | Path: "C:\Users\***\AppData\Roaming\pyRevit-Master"
master | Product: "2022.1.5" | Engine: IPY342 (342) | Path: "C:\Users\***\AppData\Roaming\pyRevit-Master"
master | Product: "Autodesk Revit 2021" | Engine: IPY342 (342) | Path: "C:\Users\***\AppData\Roaming\pyRevit-Master"
master | Product: "2020.2.1 (New Install)" | Engine: IPY342 (342) | Path: "C:\Users\***\AppData\Roaming\pyRevit-Master"
==> Installed Extensions
KLOMPTools V2 | Type: Unknown | Repo: "" | Installed: "C:\Users\***\OneDrive\pyRevit 3.4\KLOMPTools V2.extension"
==> Default Extension Search Path
C:\Users\***\AppData\Roaming\pyRevit\Extensions
==> Extension Search Paths
C:\Users\***\OneDrive\pyRevit 3.4
==> Extension Sources - Default
https://github.com/pyrevitlabs/pyRevit/raw/master/extensions/extensions.json
==> Extension Sources - Additional
==> Installed Revits
2025 First Customer Ship | Version: 25.0.2.419 | Build: 20240307_1300(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2025\"
2023.1.3 | Version: 23.1.30.97 | Build: 20230828_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2023\"
2022.1.5 | Version: 22.1.50.17 | Build: 20230915_1530(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2022\"
Autodesk Revit 2021 | Version: 21.1.21.45 | Build: 20201116_1100(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2021\"
2020.2.1 (New Install) | Version: 20.2.12.1 | Build: 20200210_1400(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2020\"
==> Running Revit Instances
PID: 28112 | 2025.4 | Version: 25.4.0.32 | Build: 20241202_1040(x64) | Language: 0 | Path: "C:\Program Files\Autodesk\Revit 2025"
PID: 29124 | 2023.1.3 | Version: 23.1.30.97 | Build: 20230828_1515(x64) | Language: 0 | Path: "C:\Program Files\Autodesk\Revit 2023"
==> User Environment
Microsoft Windows 10 [Version 10.0.22631]
Executing User: KLOMP\***
Active User: KLOMP\***
Admin Access: No
%APPDATA%: "C:\Users\***\AppData\Roaming"
Latest Installed .Net Framework: 9.0.5
Installed .Net Target Packs: v4.0 v4.5 v4.5.1 v4.5.2 v4.6 v4.6.1 v4.7.2 v4.8 v4.X
Installed .Net-Core Target Packs: v9.0.300
pyRevit CLI v5.1.0.25094+1131-wip.ffa32944090b8fb19834361c5750674555b2c0a2

Additional context

No response

[sanzoghenzo]

@jmcouffin can you reproduce this? I'm once again without a Revit installation right now 😅

@Levii-L can you please try this piece of code and see what it does?

from pyrevit import script

output = script.get_output()
ouput.log_info("12345")

[jmcouffin]

@jmcouffin can you reproduce this?

Can't do today or tomorrow. I will try to squeeze that in later this week.

[Levii-L]

@jmcouffin can you reproduce this? I'm once again without a Revit installation right now 😅

@Levii-L can you please try this piece of code and see what it does?

from pyrevit import script

output = script.get_output()
ouput.log_info("12345")

@sanzoghenzo It's giving me the following output:

[sanzoghenzo]

OK, I just installed Revit 2025 and I'm able to reproduce the bug.

Not sure where can I find the culprit, but I'll investigate.

[sanzoghenzo]

the print function calls the Write method of the ScriptIO class:

pyRevit/dev/pyRevitLabs.PyRevit.Runtime/ScriptIO.cs

Line 67 in b8ef03f

public override void Write(byte[] buffer, int offset, int count) {

if I attach the debugger and run a command (color splasher for example), i got two problems:

• the buffer variable contains the text bytes, each of them separated by zeros (UTF-16 maybe?), so the resulting outputText variable is something like this:

  "&\0c\0l\0t\0;\0d\0i\0v\0 \0c\0l\0a\0s\0s\0=\0\"\0l\0o\0g\0d\0e\0f\0a\0u\0l\0t\0 \0l\0o\0g\0e\0r\0r\0o\0r\0\"\0&\0c\0g\0t\0;\0&\0c\0l\0t\0;\0s\0t\0r\0o\0n\0g\0&\0c\0g\0t\0;\0E\0R\0R\0O\0R\0&\0c\0l\0t\0;\0/\0s\0t\0r\0o\0n\0g\0&\0c\0g\0t\0;\0 \0[\0p\0y\0r\0e\0v\0i\0t\0.\0c\0o\0r\0e\0u\0t\0i\0l\0s\0.\0g\0i\0t\0]\0 \0C\0a\0n\0 \0n\0o\0t\0 \0l\0o\0a\0d\0 \0L\0i\0b\0G\0i\0t\02\0S\0h\0a\0r\0p\0 \0m\0o\0d\0u\0l\0e\0.\0 \0T\0h\0i\0s\0 \0m\0o\0d\0u\0l\0e\0 \0i\0s\0 \0n\0e\0c\0e\0s\0s\0a\0r\0y\0 \0f\0o\0r\0 \0g\0e\0t\0t\0i\0n\0g\0 \0p\0y\0R\0e\0v\0i\0t\0 \0v\0e\0r\0s\0i\0o\0n\0 \0a\0n\0d\0 \0s\0t\0a\0y\0i\0n\0g\0 \0u\0p\0d\0a\0t\0e\0d\0.\0 \0|\0 \0[\0E\0r\0r\0n\0o\0 \0-\02\01\04\06\02\03\02\07\09\09\0]\0 \0T\0h\0e\0 \0g\0i\0v\0e\0n\0 \0a\0s\0s\0e\0m\0b\0l\0y\0 \0n\0a\0m\0e\0 \0w\0a\0s\0 \0i\0n\0v\0a\0l\0i\0d\0.\0&\0c\0l\0t\0;\0/\0d\0i\0v\0&\0c\0g\0t\0;\0\r\0\n\0"
  

  The output window only shows the first character, I suppose because it interpreters the 0 byte as the end of the text;

• removing the zeroes, I got the our old friend

  &clt;div class=\"logdefault logerror\"&cgt;&clt;strong&cgt;ERROR&clt;/strong&cgt; [pyrevit.coreutils.git] Can not load LibGit2Sharp module. This module is necessary for getting pyRevit version and staying updated. | [Errno -2146232799] The given assembly name was invalid.&clt;/div&cgt;\r\n
  

Not sure what changed these few months, if this is a regression or if it was never tested/fixed in Revit 2025 + IronPython 3.4.

I don't think I can squeeze enough time to tackle this, unfortunately.

[jmcouffin]

This is great. I will try to look more into it. At least to see if this is a regression.
Thks @sanzoghenzo

[jmcouffin]

not related 🐇 🕳 because once I let the debug log run, I found out that error :

• in IPY342

  pyRevit/pyrevitlib/pyrevit/coreutils/git.py

  Line 27 in 3772c6e

  if PY3:

  is being detected as PY3 because the compat module (pyrevit.coreutils.git) says so, therefore tries to load the LiGit2Sharp assembly with the wrong clr method: AddReference instead of AddReferenceToFileAndPath
  fixing it with:

"""LibGit2Sharp wrapper module for pyRevit.

Documentation:
    https://github.com/libgit2/libgit2sharp/wiki
"""

import os.path as op
from collections import OrderedDict

from pyrevit import HOST_APP, PyRevitException
from pyrevit.compat import safe_strtype, IRONPY3, IRONPY2
from pyrevit import framework
from pyrevit.framework import clr
from pyrevit.framework import DateTime, DateTimeOffset
from pyrevit.coreutils.logger import get_logger

# pylint: disable=W0703,C0302
mlogger = get_logger(__name__)  # pylint: disable=C0103


GIT_LIB = "LibGit2Sharp"

LIBGIT_DLL = framework.get_dll_file(GIT_LIB)
mlogger.debug("Loading dll: %s", LIBGIT_DLL)

try:
    if IRONPY3 or IRONPY2:
        clr.AddReferenceToFileAndPath(LIBGIT_DLL)
    else:
        clr.AddReference(LIBGIT_DLL)

that explains the errors I got at the beginning of the debug log

2025-06-13 14:07:12,653 ERROR [ pyrevit.coreutils.git] Can not load LibGit2Sharp module. This module is necessary for getting pyRevit version and staying updated. | [Errno -2146232799] The given assembly name was invalid.

---

and, I already hear you laughing already @sanzoghenzo / @dosymep ,
I get a brand-new error, (totally?) unrelated

and if I comment this in the class GenericUICommand(GenericUIComponent) in pyrevitlib\pyrevit\extensions\genericcomps.py:
# mlogger.debug('command tooltip: %s', self._tooltip)
everything works well. 🙄

then tried to debug somehow:

 mlogger.debug('Command title: %s', self.ui_title)
        try:
            mlogger.debug('command tooltip: %s', self._tooltip)
        except Exception as err:
            mlogger.error(
                'Error reading command tooltip: %s | %s',
                self._tooltip, err
            )

then tried to remove the tooltip of the first yaml file encountering the exception, then a second...
the parsing of the yaml file is becoming broken if I fix the AddReference LibGit2Sharp error while under IPY342! 😓 😠 🥵, because before that fix, I could run pyrevit under IPY342

So/// going back to IPY2712, tooltips are parsed properly (with the fix for the git library... )

So much fun...