I just spent 2 hours working on a GDTF file, only for the fixture builder to expire my session right at the end! After logging back in, I couldn't find any way back into the builder that wasn't "create new fixture", meaning my data is lost. I think there needs to be a mitigation against this - preferably, sessions never expire and data should be autosaved frequently to local storage if possible. Since there is no way to save GDTF files without uploading them to the share there is no way to manually keep backups either.