Virtuemart 2.0.6 on Joomla 2.5.4
The price override in the product details seems to be bugged. It is impossible to uncheck the checkbox.
When you uncheck the checkbox and you save the product. The checkbox is again checked when the page reloads. Same result on save and close.
Hope this report helps, good work on the system btw.
Please use search first,
http://forum.virtuemart.net/index.php?topic=101414.0