VirtueMart Developer Portal

(This is related to the Checkout Login bug I posted the other day, but I just noticed it's much worse than I thought.) I've been having No InterWiki reference defined in properties for 'url=http'this/url bizarre problem with checking out in my VM store (VM 1.0.7, Joomla 1.0.11), and I just noticed something that is a pretty severe security issue -- not only do users have to login twice every time they want to use the store, they also have to log out twice!

Logging in twice was a pretty big annoyance -- I've noticed that Joomla seems to remember their first login, and then Virtuemart is asking the users to log in again -- but when the user clicks on log out, they only appear to be logged out! The username/password area becomes blank again, but if I go back to other areas of the site, the "edit" icons for Joomla content are still visible... worse -- if I then go back to VirtueMart, I am logged in again!!

I've had this problem using both the Joomla login module and the VirtueMart login, and the result is the same.