I just started CS6 creative cloud, wanted to transition from FCP. Second project, running Mac Pro 4,1, OS 10.6.8, 2.66 quad core. I have an SSD as my system disk, and two 500 Gb HDD striped as my media disk. Fotage is AVCHD, 1080p 24p from a Canon C100. (First project was HDV from a Sony Z1U, didn't ave this problem.) After a few minutes, nothing will play in the timeline or proram or source monitors. I restarted the program once and it solved the problem, but I can't be restarting every 5 minutes. This is infuriating.
Moved from the Creative Cloud to the Premiere Pro forum. They will be able to help you here.
1st, what is your graphics adapter (usually ATI/AMD or nVidia) and what is your driver version?
--Going to a new program will often require a graphics driver update
2nd, did you do the below process to be sure your sequence and video match?
See 2nd post for picture of NEW ITEM process http://forums.adobe.com/message/3776153
-and a FAQ on sequence setting http://forums.adobe.com/message/3804341
NOTE that I don't use CC, so it may be possible that CC does the sequence setting for you
Also, The tutorial list in message #3 http://forums.adobe.com/message/2276578 may help