Just upgraded to PT HDN and getting errors

[IVcrane]

I just installed PT11 HD native via thunderbolt. I keep getting the following error during session playback. This is a session that played back without error at 32 samples using PT 11 vanilla.

"Audio processing could not complete due to conflicts with other CPU tasks or a potential clocking issue. If this occurs often, verify your sync cables or try changing the HW Buffer Size setting in the Playback Engine dialog. In most cases, a larger HW buffer size will prevent the problem. (AAE -9093)"

This session is just a scratch demo session of about 20 tracks and maybe 15 plugins, and no VI tracks. The track will only play back at a 256 buffer. A drastic difference from the 32 without even a hiccup on same computer with PT 11 vanilla.

[propower]

Could you post a complete list of your system and plug ins? Also any other things to mention - picture of PT System Usage and Apple Activity Monitor (CPU) for the given session are also helpful.