http://bugs.winehq.org/show_bug.cgi?id=31442
--- Comment #39 from voidcastr voidcastr@gmail.com 2012-10-07 13:44:27 CDT --- (In reply to comment #38)
Sounds like the imm32 bug of League of Legends (http://bugs.winehq.org/show_bug.cgi?id=30585 : try to replace SendMessageW with SendNotifyMessageW.
As expected this works when swapping the lower call to SendMessageW with SendNotifyMessageW, since the latter does not block (per definition from MSDN). The question remains if it is sensible to do so.