Joomla! 2.5.24
VirtueMart 2.6.8
I have only one payment option i.e. paypal and with following setting on configuration page
'One Page Checkout enabled' is not checked
'Enable Automatic Selected Payment?' is checked
But when proceed to on payment page using checkout, paypal module is pre-filled with errors (i.e error occur without submitting any details on payment page)
see screen shot attached.
[attachment cleanup by admin]