4
There are few issues:
1) For whatever reason, your PHP version was 5.2.17. The minimum version for XOOPS 2.5.6+ was 5.3.7+
So I don't know how this happened. I've changed that to PHP 5.4, and you can now login without any problem.
2) Did you do yesterday a backup of the Database? Or do you have a Cron job to do it for you? It was kind of unusual to see a database dump there.
3) There is also a very strange directory on your server, which is not part of XOOPS. Did you or Arvixe people do anything? If not, notify them ASAP as possible, because it might be a hacker's job, and they should be aware of it.
4) You had this empty place in the middle, because you seem to move again the block to the right, instead of keeping it in the middle. I moved it back there.