http://bugs.winehq.org/show_bug.cgi?id=35361
--- Comment #2 from Ken Thomases ken@codeweavers.com --- This appears to be a problem with the Steam in-game community overlay. Try disabling that in Steam's settings to see if it helps. (That's a diagnostic step, not a solution.)
Since Steam can update spontaneously, it's not necessarily a Wine regression. To be sure, you'd have to go back to the earlier version of Wine to see if it still works well.