I would expect that the infinite redirect is probably a conflict with vbSEO. The two products must be fighting over who gets to change the thread URL... vbSEO is a paid-on, so I cannot offer support for this issue.
I would recommend making sure that any vbSEO showthread_start or forumdisplay_start plugins, if it has any, have an Execution Order HIGHER than 5. If this doesn't help, I would need admin access to see what your setup is like.
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