Have you made any changes to the gallery or installed any hacks? It looks like it's not recognizing the variable "catid", but it recognizes "c" just fine. There shouldn't be any reason it would do that though.
no, I have not done any changes to the gallery. The only "hack" I have installed for the gallery is that "Javascript Fix"! And I did the Photopost import, that's all!
I have two vBulletin 3.5.0 installations, both with vBa Gallery 1.0.1. One has vBSEO 2.1.1 installed and the other one doesn't. I can confirm that this error only appears on the one with vBSEO. So is this a vBSEO issue?