If you login to my site - (play with the user called wayne2)
If you go to Membership -> All Members -> Under Subscription Column Choose The Move Option -> Move From Current and try moving to another.
The move actually happens but the page never loads. It locks the browser (Using Safari Mac OS X) and then if you try clicking on any other page you simply cannot go anywhere without closing the browser and re-opening it.
Would be grateful if you can take a look.