So far 11.5 has been very stable. There are some good improvements but some that need to be reworked. I have had the system crash when printing an order. I had AC tech look and he found an issue from the Microsoft side, reset a couple of things and I have not had that issue again. Sorry, not very technical and only did this on Thursday of last week. I will keep you posted. It is my understanding that 11.5 is still considered Beta and 12 is being back tested. I asked to be able to beta test 12 as soon as it is available.