I'm in the same situation. After the virtuemart 3.8.6 10373 update every time I try to enter in the products backend page it shows a 1054 Unknown column 'Array' in 'where clause' error. When I try to update the database tables, it shows a message:
alterColumns jos_virtuemart_waitingusers from TIMESTAMP NOT NULL DEFAULT 'CURRENT_TIMESTAMP()' ON UPDATE CURRENT_TIMESTAMP() to notify_date TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
alterTable CHANGE jos_virtuemart_waitingusers.notify_date
What's happening?
thanks