Tried to update available fields on Beta 5 and got the following msg:
An error occured processing the records. The error occured is shown below if available. Additionally check your server log for any errors or warnings.
Warning: Invalid argument supplied for foreach() in /public_html/administrator/components/com_csvi/addon/com_virtuemart/model/maintenance.php on line 1200
Warning: Invalid argument supplied for foreach() in /public_html/administrator/components/com_csvi/addon/com_virtuemart/model/maintenance.php on line 1200
Warning: Invalid argument supplied for foreach() in /public_html/administrator/components/com_csvi/addon/com_virtuemart/model/maintenance.php on line 1200
{"run_id":98,"info":"Available fields have been added for table categories","continue":true,"cancel":false,"key":1,"process":true}
Not sure why though

Rgrds,
Chris