Hello I use VM2.0.22.a and the button add to cart not working on Firefox 22.0 and IE 10.... ??
Use IE10's debugger to see what the issue is - most likely jscript. http://msdn.microsoft.com/en-us/library/ie/gg699336%28v=vs.85%29.aspx
ok thank you and for Firefox 22.0 an idea ?
For FF use Firebug. https://getfirebug.com/javascript
This problem annoyed me for ages. I use chrome and only use IE10 for testing sites. I had my IE settings set to never allow cookies. I changed this and now the cart works as it should. I noticed this because I tried to make test purchases on 2 other sites I know use the same version of Joomla and Virtuemart. Simple mistake caused me a big headache.