Freeze on linux

[zavinator]

Hi, tk-blender is freezing on my Fedora 32.

Tested with blender 2.83 LTS (installed via dnf install blender)
Then tried latest blender 2.93 from blender site (with pip installation of PySide2).

I see the Shotgun menu, but when I for example try to save a work file - it displays an empty workfile window and then it freezes.

Also tested with these versions of tk-framework-shotgunutils_v5.x.x (as described in README)
tk-framework-shotgunutils_v5.x.x: v5.7.7, v5.7.8 and latest v5.7.10

Last messages from tk-blender.log:

2021-04-08 13:55:13,197 [1375808 DEBUG sgtk.env.project.tk-blender.tk-framework-shotgunutils] Initialized settings manager for 'tk-multi-workfiles2'
2021-04-08 13:55:13,197 [1375808 DEBUG sgtk.env.project.tk-blender.tk-framework-shotgunutils] User Settings Manager: Retrieving step_filters
2021-04-08 13:55:13,199 [1375808 DEBUG sgtk.env.project.tk-blender.tk-framework-shotgunutils] Initialized settings manager for 'tk-multi-workfiles2'
2021-04-08 13:55:13,200 [1375808 DEBUG sgtk.env.project.tk-blender.tk-framework-shotgunutils] User Settings Manager: Retrieving step_filters
2021-04-08 13:55:13,290 [1375808 DEBUG sgtk.env.project.tk-blender.tk-multi-workfiles2] Retrieving current scene path...
2021-04-08 13:55:13,305 [1375808 DEBUG sgtk.core.platform.bundle] <Sgtk App 0x7fc716f54f10: tk-multi-workfiles2, engine: <Sgtk Engine 0x7fc71fc31750: tk-blender, env: project>>: Resolved hook expression (associated with setting 'hook_scene_operation'): '{engine}/tk-multi-workfiles2/scene_operation_tk-blender.py' -> ['/my_path/install/git/tk-blender.git/v1.1.1/hooks/tk-multi-workfiles2/scene_operation_tk-blender.py']
2021-04-08 13:55:13,319 [1375808 DEBUG sgtk.env.project.tk-blender.tk-framework-shotgunutils] Task Manager: Started new background worker thread (num threads=4)
2021-04-08 13:55:13,319 [1375808 DEBUG sgtk.env.project.tk-blender] Detected std style sheet file '/my_path/install/app_store/tk-multi-workfiles2/v0.12.6/style.qss' - applying to widget <tank.platform.qt.tankqdialog.__FileSaveForm_TkWidgetWrapper__(0x7fc71332e740, name="FileSaveForm") at 0x7fc714fc7410>

Can you help - how to troubleshoot?
Thx