I have had 3 users now contact me and claim TaskCard has deleted their sheets or stopped saving automatically but this was not actually the case after talking with them further.
The problem was that TaskCard since adding DropBox support in 1.5 filters out names that contain – ( or ) characters to avoid conflicts with some DropBox copies which can be made by conflicting file dates.
I should have made the filter more strict as it was a stupid decision to just omit those files without warning (as if users don’t ever use them).
Sorry for the confusion and I will fix this in the next minor update!