9.2.3 Runtime and 8.1.3 Compiler

We are about to upgrade all our users ( -500) from the 8.1 run time to 9.2.3. I dont expect any problems, but because of the number of users involved, I just want to check. Is anyone aware of any possible problems running applications produced by the 8.1.3 compiler with the 9.2.3 run time?