I just updated from phpBB 3.3.2 to 3.3.3. There were no problems with my localhost test environment, but my production server had a change in behavior reporting the version information.
Neither clearing my
cache/ directory (from the command line) nor restarting apache could change the Administration Control Panel reported version. It was warning me that the software was not up to date (version 3.3.2).
Finally, I forced an update check as System --> Check for updates and the status changed to 3.3.3.
There were no other issues.