Server move: nothing works.

[Peter Ostry]

No response from vBulletin.com but we are really in trouble here ...
Excuse me to post it here either.

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I get this on top of the start page and only this (on a blank page) when I try to log in into admincp:

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Warning: array_keys() [function.array-keys]: The first argument should be an array in [path]/includes/functions.php on line 4107

Warning: Invalid argument supplied for foreach() in [path]/includes/functions.php on line 4107
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vBulletin 3.7.5 PL1. We want to launch a new site today, moved the whole webroot and the MySQL database to another server. The files were moved via the shell and using a tar archive, the database was moved by mysql (not phpMyAdmin). I adapted the config.php and we don't use any special database thingies, no memcache, datastore, nothing that is mentioned in the various posts I found about this issue.

I see an incomplete forum start page but cannot login into the admin.cp

If it helps, there is also a MODx installation on this server that doesn't work either. It looks like a path/include problem. The document root of the two servers is different. I don't see a difference in php ini.

Can I fix this somewhere in a file or directly in the database?
Needless to say, its very urgent, thanks in advance.