[Problem] Not Responding and No Solver Backend Found Error

[vyasji-007]

Is there an existing issue for this?

• I have searched the existing issues

Version

0.20 (Release)

Full version info

[code]
OS: Linux Mint 21 (X-Cinnamon/cinnamon)
Word size of FreeCAD: 64-bit
Version: 2024.409.0.14555 (Git shallow) AppImage
Build type: Release
Branch: (HEAD detached at 20240407stable)
Hash: 973e4821bcd19a5a1af9ae3e1d2ed961aad0a8ab
Python 3.11.6, Qt 5.15.8, Coin 4.0.1, Vtk 9.2.5, OCC 7.7.1
Locale: English/United States (en_US)
Installed mods: 
  * QuickMeasure 2022.10.28
  * sheetmetal 0.4.23
  * freecad.gears 1.2.0
  * fasteners 0.5.24
  * ExplodedAssembly
  * 3DfindIT 1.2.0
  * A2plus 0.4.65
  * Curves 0.6.42
[/code]

Subproject(s) affected?

Other (specify in description)

Problem description

Issue is with A2Plus, the rotation, panning, selection everything has very slow response while navigating using mouse.

Secondly, the solver error message came like this when I open my assembly in A2Plus is (two days ago work absolutely fine without any problem loading all files)

1. 0.980591 <asm3.main> init_gui_py(14): No solver backend found
2. FreeCAD LinkBranch not responding
   

Anything else?

No response

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