Board Thread:Support Requests - Getting Technical/@comment-1267828-20140911045716/@comment-168424-20140913154752

Since chat is Wikia specific, I would start by reporting your problem to Special:Contact/bug.

Otherwise I would consider looking for malware or some other thing you installed that is messing with Javascript, since I believe Chat is mostly JS based. It is unlikely to be something on Wikia's side since you said the problems seem specific to your machine.