After install 2.0.20b i have empty screen! Help!
Joomla v 1.5.26
www.zbikers.ru - social network for bikeres
Some functions do not work properly when using Joomla 1.5 with VirtueMart 2 instead of Joomla 2.5 - It was announced that Joomla 1.5 is no longer supported for VirtueMart - http://virtuemart.net/news/list-all-news/426-end-of-life-for-virtuemart-11-heidelpay-now-in-virtuemart-2012
"We decided to declare now the end of life for VirtueMart 1.1, and that the version 2 of VirtueMart is not any longer maintaining joomla 1.5 compatibility." 4 October 2012
But what you have is an extreme! I suspect something went wrong during the installation so you may have to revert to a backup. But first check the server error log in case you actually have a 500 error - the log will show the problem if you have.
you have even more luck with the latest version http://forum.virtuemart.net/index.php?topic=115877.0 we added for 1-2 important functions a fallback.