A) shut down and started up your machine after the update and
B) checked your memory & processor settings?
Yes. Rebooted and checked all my settings. No other drivers have updated, no other new software or hardware.
Yes. when using Particular 2.1 I find that if I have MP turned ON it takes forever to set up the processes. Getting out of the MP mode at that point is difficult but possible. Once MP is off everything renders great.
I have no other issues with any operations in the CS6 suite.
This happens on a HP Z820 with all current software/drivers.
I had the feeling that may be the case.
However, I am still getting the problem on a job that imports flat files (PNGs) as well now.