Actually, this isn't a problem, it's just that we've added the possibility for an externally hosted file in the customer portal. The current system gets filesize on the fly, so there isn't a table entry for "filesize"...This just has to be added, so we can manually specify the file size when adding an externally hosted file
Hope that wasn't too detailed an explanation, but the short of it is yes, we know its an issue, and we'll fix it as soon as possible.