It seems that I took for grant that everybody have SSE4 :-), that's why I didn't have any issue, time to deploy the patch!
04/02/12, 1.5a maintenance version
The engine now checks if PopCnt is available (that stop the engine crashing on machines with no SSE4)
The endings are not longer based on strings but on hash
beta hits updated the history entries
CanTraverse() tweek a bit, it could discard valid moves
New unit, not used yet
Killers updated when a bet cache is hit