To anyone having problems with Titanium Backup latest version 3.7.6 (most recent update) force closing after it tries to allow root access... use THIS link:
http://matrixrewriter.com/android/
It's the previous version 3.7.5 I found on the dev's website after a quick Google search on the problem.
If you're like me and made a Titanium backup before yesterday evening, installed Liberty GB and redownloaded Titanium from the Market to restore all your apps, Titanium's dev put out an update just last night and for some reason it WILL NOT work with Liberty GB - just immediately force closes when trying to gain root access no matter what you do (as already mentioned, clicking "forget" in the Superuser app and reopening/reinstalling does not work) - and you are stuck in a new ROM and not able to restore your apps. This should temporarily fix that.
Hopefully the dev will jump on that bug quick as the Market reviews for the app have already been flooded with people *****ing up a storm!
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