NEW BUG: RB 4.1.2 - Deck 4 loses focus after using crossfader

Found a new bug in 4.1.2 when using 4 decks. Running mac OS on a DDJ-RZ. To reproduce the bug,

load a track in the two right decks, deck 2 and deck 4.  Switch to deck 4 and quickly move the cross fader from center ro left right or all the way left. When the cross fader is all teh way to one side, you are no longer controlling deck 4 and it switches the controller to deck 2 !!!  Realzied this when I was running a track in deck 1,2 and 4. Deck 4 was scratch samples and moving the cross fader gives up control of deck 4.  I was able to reproduce this a few times. Hoping for a quick fix for this new bug. (didn't exist in 4.1.1 and below)