This week I was advised to update a HWQS 8.5 system to 10.6 because we had problems with a 1-2 second delay when using RF wallbox keypads to control MI link zones. This delay was very consistent. RF control of RF zones in 8.5 had no such delay. Wired QS keypads had no such delay. Updating to 10.6 was quick and painless and worked as-advertised.
It's one of the few times I've done an OS update to fix a problem, and I was surprised to see it wasn't published in the revision notes.
I'd like this to be a thread where others contribute the same solutions.