Here's another issue!  Ha ha.  So I have an app that's got a MySQL Database back-end.  There is a table that has certain categories that has records being periodically dropped.  I have a page for adding and removing these categories, which is the only place I see a delete statement regarding that table.  It's an old app, so I've built the add/remove logic into the querystring.  I'm thinking they may be going to a version of the page that's stored in their history rather than directly to the page, sans querystring.  This might be the issue.  However, I also don't think the categories have changed in the few years or so since they've had the app, so I can't see why this would be in the history of their web browser.  Can anybody at all see any reason records would just be dropped from the table without human intervention?  The only reasons I can think are the aforementioned querystring issue or someone coming in and manually deleting them.  Unfortunately, the latter sounds like a better possibility.