[Bug]: Maya 2026 PySide6 Error on currentIndex str conversion in falloffDialog.py

[maumemoli]

Summary

When I try to create or load a system simplex on Maya 2026 I am getting the following error:

#   File "...Documents\maya\modules\simplex\scripts\simplexui\falloffDialog.py", line 367, in loadSimplex
#     self._falloffMapper.addMapping(self.uiFalloffTypeCBOX, 1, currentIndex)
# TypeError: # 'PySide6.QtWidgets.QDataWidgetMapper.addMapping' called with wrong argument types:
#   PySide6.QtWidgets.QDataWidgetMapper.addMapping(QComboBox, int, str)
# Supported signatures:
#   PySide6.QtWidgets.QDataWidgetMapper.addMapping(PySide6.QtWidgets.QWidget, int)
  PySide6.QtWidgets.QDataWidgetMapper.addMapping(PySide6.QtWidgets.QWidget, int, Union[PySide6.QtCore.QByteArray, bytes])

Expected Behavior

in falloffDialog.py the string currentIndex should be converted to a QByteArray when QtLib.IsPySide6 == True

Steps to Reproduce Behavior

Open Maya 2026
Create Sphere
Launch Simplex
Set the Sphere as Current Object
Create New System

Solution

I modified line 364 on falloffDialog.py
from: if QtLib.IsPySide2 or QtLib.IsPyQt5:
to: if QtLib.IsPySide2 or QtLib.IsPyQt5 or QtLib.IsPySide6:
and that fixed the problem.

Environment

• Version 3.0
• Maya version: 2026.2
• PySide version: 6
• Python version: 3.11.9

Additional Context

I haven't done any further testing so far to see if anything else is broken.

[tbttfox]

You're absolutely correct, this is definitely a bug, and I appreciate you bringing it up. If you find others, please let me know!

Unfortunately we're working on the Qt6 transition ourselves, but (as always) there's a hundred other fires to put out before we get to this. And we'll be updating to Qt.py>=2.0 as well, so I'm sure there's quite a bit that will need fixing. Like those enum values requiring the extra namespace.

So, as annoying as it is, I probably won't have time to mentally shift to fix this properly any time soon.

[maumemoli]

Thank you for the reply!
I will roll back to a previous version of Maya in the meanwhile just to be safe.
Cheers