Error messages on account creation are not showing up

In a somewhat recent update, the account creation no longer shows any error messages (password not typed properly, missing required field, etc.). From what I can see in the code (I haven't had a lot of time to trace it yet), this seems to be a conflict between Membership and BuddyPress. I can't say for sure which upgrade caused the problem, since it was noticed/reported somewhat late.

Has anyone seen this issue before?

Membership Version 3.4.6.1
BuddyPress Version 1.8.1 (problem is still there with BuddyPress 1.9.1 which I have in my test domain, pyrosonix.com)