[P Stephen]

I recently upgraded from 4.11 and only have had issues with hoster crashing when I would click PLAY for someone to sing. Have had the audio background running. This past Monday night. I only had Hoster running and I crashed once. No background music. I was running fill music from our backup computer. 1st rotation was fine. 2nd rotation...all songs that have a key down...the music sounds garbled. I removed hoster last night. Reinstalled and it's still there. I need some help really bad. This computer is only a couple of months old.

Toshiba P875-S7200 i5-3210M @ 2.50 ghz 6gb ram 64bit. win 7 with all updates

First of have you checked you have all the latest windows updates including the latest windows media player ?
Also make sure if you have an antivirus installed it is not running a scheduled scan at the same time.

Regarding the key down problem, try messing with the Tools/Audio Controls "Prevent audio drop outs" settings it should be defaulted to 10, experiment with other settings to see if it improves it.