I’ve not been a long time player of the game but I noted that for a long time in the past, the web version of the popular Facebook game by Zynga had been broken in Opera. Not sure who made the fix, but as at Opera 12.50 pre-alpha the game works .
The long standing issue seemed to be a bug in the way Drag and Drop was being handled by the game. When tiles were moved from the rack, they disappeared from under the mouse, and could not be placed on the board.
Opera 12.50 has seen loads of fixes to their Drag and Drop implementations so perhaps that has been the source of the fix for this issue.
Anyway, back to gaming and taking down people in a battle of words