1 - Backend logged as "storeadmin", a new tab "list users" which gives blank page if clicked appears under store - see image.
(http://img816.imageshack.us/img816/3658/bugvm.jpg)
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2 - Clicking on components VM will take you to the last page you were seeing instead of to the initial VM administrator, this sometimes will say "can't find order" if you were at order details and went back to joomla.
3 - Creating users - If you forget to enter one of the mandatory fields will remove all the details for a user and you will have to enter it all again.
Don't know if these are issues I have with VM or VM bugs.
btw I'm using VM 1.1.8 and Joomla 1.5.22