We have 3.7.2.
I think we found the issue though. The invalid call to script is only a symptom of photpost failing to work with the vbulletin cookie. So we are trying to fix the domain cookies, and although everything looks alright, something is still broken. And mostly only in IE6
IE6 users get logged out when trying to vew a member gallery, and then when they log back in, it gives invalid call to script errors :S