I came across this bug whilst writing a thread in Admin & Config
https://forum.virtuemart.net/index.php?topic=102823.0
Quote..
In the product pricing area (for individual products), there is an area called 'pricing rules overrides'.
...TWO things...
1) The selection device has changed into a 'pull down', therefore only one item can be selected
2) The 'apply generic rules' option does not seem to apply the rules that have been created