Thank you for supporting the virtuemart project.
Please visit our international forum https://forum.virtuemart.net/
In case you encounter a bug, please visit our forum first. https://forum.virtuemart.net/index.php?board=127.0 . Many bugs are rooted in non compatible layouts or 3rd party extensions, which break the java script. Some of them can be handled by different options, other "bugs" happen due misunderstanding of the background concept. https://docs.virtuemart.net/manual/general-concepts.html
In case the bug is verified in the forum, and the head developer Milbo did not fix it directly, you may open a ticket here http://extensions.virtuemart.net/ticket. Please report also all security related issues over the ticket system and not the forum. Thank you.