I have a Mimaki JV3 75SPII, running off a MAC to PC production manager. Color profiles worked just fine, UNTIL I got a new MAC & had to upgrade from FLEXI 7.7 to 8.5v2. Once installed, printing is a disaster! Terribly grainy, streaking/banding...I've tried various media/color profile combinations, and nothing seems to change! Am I missing something obvious??