There are some plugins that break the functionality of CSVI VirtueMart.
Known plugins to break CSVI VirtueMart are:
Here is a possible solution to fix the conflict between CSVI VirtueMart and xajax. You need to modify the xajax file following these steps:
$conflictingExtensions = array ();
$conflictingExtensions [] = 'com_csvivirtuemart';