Can't open my .sh3d files anymore with Sweethome3D on Mac

[m0e2k6]

Hi everyone,

this is my first post and I tried the search function before posting. Apparently I could not find my issue before.

I was drawing plans beginning this year and everything was fine (including saving and reopening - last time end of february this year).

Without having changed anything (no major systemupdate, no copy of the file etc.), when trying to open the files by clicking file->open simply nothing happens. No error message, but also no opening of the file. I simply stay stuck in the sytembrowser/open file window.

Also by doubleclicking in the filebrowser nothing happens.
These have been many drawings and I'd be happy if someone could help me with this.

I'm using Sweethome Version 6.6a running on a macbook air with Big Sur (11.6.2).

Best wishes and many thanks in advance
Stephan

[Puybaret]

Can you create a new file, save it and reopen it?