For some reason, I finally got the dreaded "stuck notes" everyone has been talking about using DP 8.05 with this latest update. I tried to double check a few things. First was a restart of both Master and Satellite machine (upgraded both at the same time). I also tried running with and without Auto Delay Comp.
Once the usual set of tricks didn't work, I downgraded back to 5.3.13045, and everything is back to normal again. It's very strange as I've heard about this problem but never experienced it myself until now. Seems like an absolute nightmare to try and diagnose as it varies so much from user to user.
In case anyone else runs into this problem, 5.3.13045 is working for me.