Lightup has a Light Insolation analysis option. Not heat transfer though.

https://i.imgur.com/zx56vXW.png

There is an open source tool called OpenFOAM. But its not integrated with SketchUp so you need to tweak stl files. I tried a few years ago but I went nowhere with it. Any info I got on it was either based on the examples files it comes with or data from some other package.

To be honest I couldn't even get it to read .stl files exported from SketchUp.

Search your system for Preferences.dat

What does the Extensions > Sketchucation > My Shortcuts menu show as your shortcuts?

@unknownuser said:

What is the reason for this?

None I know of but most likely user intervention in some way

@unknownuser said:

Is there any way to restore it?

If you have a restore point on your device you could roll back

@unknownuser said:

Why did this happen?

Considering the absence of info its hard to say. I don't know what 'running my files' means.

The scenes also use the hide and unhide functions of sketchup;
when you group it disrupts that function