[Zubersoft]

If the behavior is inconsistent, it usually points to some kind of connection issue. My code will attempt up to five times to download a file if a failure occurs, so another possibility is if the underlying file is locked for some reason, and it can't be deleted or overwritten, that could also cause a failure I suppose. If you go to Settings->Other Settings->Find Missing Files, I'm assuming you have no missing files in the primary library, correct?

Mike