Loading failed, no geometry data

Yesterday I was printing a large print from Bambu Studio. Today (while working remote) I cannot open any 3mf or stl file. All files result in two error messages:
“The file does not contain any geometry data”
and
“Loading of a model file failed” (only when opening 3mf)
I have tested with loads of 3mf and stl files but I am unable to open any file.

I have searched this forum but cannot find any solution.

Bambu Studio version is 1.9.3.50

I don’t know what has changed since yesterday except I’m not at home right now. Studio version was already updated weeks ago.

Any suggestions would be greatly appreciated.