Hitting play blacks out the editing screen
I am using LOGIC 9.1.8 on a new Mac Book Pro & Yosemite. When I hit play my editing suite blacks out all tracks behind the cursor. This did not happen on my old Mac (before Yosemite) but it is also NOT happening on my big, new iMac which also has Yosemite. Any ideas of why this may be and what I can do to correct it?