I've checked the javascript multiple times misskalunji,
before releasing this version and after you said you've got errors to handle...
well, on my system tested (nowhere else) and i can't find any error not even any "nonworking" condition but to have an disabled ajax in the acp.
Well, please check as described:
activate ajax for your board in acp and activate ajax for this hack too
then find any hidden content that you CANNOT see by default (if you're an administrator or mod or hack is disabled in that forum or something)
to check wait for the page loaded completely (even better wait some seconds more

)
then reply to the thread or click the thanks button.
(you will have to wait then for servers reply to that request, first hidden content is updated first then second (if visible) and so on.)
maybe this will take upto another five seconds (if you have large posts to be updated)
If you still don't see any hidden content without page reload, this javascript wont work with your javascript-engine installed (please let me know which one that is)
Or: you don't have javascripts enabled, but then you will have no ajax throughout the vbulletin page...
'sid