Jeutie's repack uses Trinity and as far as I know, hasn't been updated since July '13, which means at this point it is very out of date. If you're feeling up to it, you could compile a fresh copy of Trinity (Lots of easy to follow tutorials in tutorial section) and see if that issue persists and if so, lodge a bug report over at
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Another thing that comes to mind is possibly it's just a visual issue, meaning you still have the normal crit rating but it just shows as 0%. Can you verify whether or not you are able to crit? I remember a lot of cores had issues with some stats displaying, like hit rating always said 0. The bug may be fixed now. Tonight if I get a chance, I'll compile a Trinity server and see if I have the same issue.