WP Table Reloaded has worked fine for us until today. I can still view our tables via the tools menu, but when I try todo anything from the Tools menu - edit, export, etc. - I get a 404 not found page (in the template that would normally appear to external viewers of the site). I'm very happy to upgrade to TablePress, but I think I need to get this working before I do!
I suspect it is somehow related to our recent upgrade to WordPress 3.5, as we had to do a couple of patches to get it to work (seemingly like quite a few other people).