Marcelismus, thank you for your reply.
Yes, table wp_appbox exists and is filled with some non traceable data (about apps, I did not post on my blog).
I deleted these data and I uninstalled and installed your app, it seems to work fine with bbpress plugin.
… man, I dont like these non-traceable bugs :-/ nevertheless, thanks four your app, I had a lot of fun with 🙂
