Sorry, but the web parts require email to be working in SharePoint, you can't turn it off.
As for detecting an FBA Pack error, if you just search for FBA I expect you'll find the issue, as the source is marked as the FBA Pack. Sometimes though it will be something else in SharePoint causing the problem. In that case I would recommend opening the
logs right after the error occurs, and then scrolling up from the bottom until you find it. You should at least see entries for your page accesses.