Strange launch error on Mac

[MisterG65]

Hi
I've noticed if I double click an STL file on my mac S3D opens with a blank login splashscreen saying invalid credentials, even though I have remember me checked. Closing this window, without filling it in, opens S3D with an empty ... erm ... print area?
It would be nice if double clicking a file opened it in S3d - or does it, and I have done something wrong?

[brian442]

If you open the software normally from the Application launch, does it ask for the credentials in the login box?

[MisterG65]

Yes. Same again, though. If I just dismiss the Credentials Box without filling it in I get the previous workspace, with my (Licensed to ...) section in the title bar filled in.