8.4.1/8.5.1 and Prizm/BAM

Has anyone experienced any problems with APs not being able to authenticate SMs when upgraded to 8.4.1 (or 8.5.1 for that matter)? As soon as I up them from 7.3.6 to 8.4.1, I can see all the SMs “REGISTERING” but none of them actually register. Re-reg count just keeps incrementing. 8.4.1 SM and 7.3.6 AP work great, but the other way around gives me a pickle.

ANy ideas?

i have few AP working on the new 8.x version and they register SM with older version just fine.

at times this happens whent he Prizm is tired i suppose, a restart of the box settles everything.