Membership subscribers must be upgraded manually

I'm starting a new thread on this subject as I really need some help with the membership plugin and I did not get any help with my last post.

Last weekend my site started taking payments for membership subscribers. I am using Business Portfolio theme, BuddyPress and WP-Membership with 2CheckOut as a gateway.

Everything seems to be going as planned except when the trial members upgrade by paying their membership fee they are not upgraded and cannot access the members only area.

I have to upgrade them manually.

I know this should be done automatically and this may be a real disaster when some of the members who are paying monthly are cut off from their access to the members only areas.

Please advise as to what I need to do get this working correctly.

Thanks.