Nasgoth

Thanks. Your site should be patched now.
For anyone else, you can pretty much just change the pages/{@page} FURL template to pages/p-{@page} (or any other static text in the second part) to work around the issue. That will mean all of your page URLs change, though; for the moment, that's unavoidable.

@Ryan H., You can now fix it? Or return the money 34.99$?

Lol,
 

Nope.
This error was not on the previous version of IPB. This happens only on the 4.1.14.2. I sent you PM with my adress forum and my account. Check on your own.

4.1 introduced a few changes on menu. I'll take a look tomorrow.