Sporadic Add To Cart Issues In IE 10

[hotrod]

Joomla! 2.5.11
VM 2.0.22a
PHP Version    5.3.3
Site www.hnctruckparts.com

I have been told that sometimes products are not getting added to the cart with IE 10, you have to go back and add it again then it will show.
On my partners Work PC ie 10... he sees this issue but at home with the same IE version it's fine.. Site seems very slow In Ie 10.
Just can't nail it down.  trying to figure out the java script console for any errors and that's not working out for me well..  I did find this..
SCRIPT1006: Expected ')'
your-cart, line 486 character 125  when adding a product..

Can anyone that understands this give me a look and tell me if I have any errors in Internet Explored 10

Thank You
Rod

[jenkinhill]

Most likely a JavaScript issue, sounds like it is related to server or connection speed. 22a did have some bugs and was updated about 4 weeks later, however both your Joomla and VM versions are known to have critical security issues and should be updated. Current VM is 2.0.26. This may solve your issue.
http://forum.virtuemart.net/index.php?topic=118683.0

[hotrod]

Thank You, 
I am always afraid to upgrade and have problems.