Yeah, that tripped me up for ages. If you set it AFTER you issue the Graphics command it won't do anything. That was frustrating and I was running on the assumption that the command was broken - until I moved to BEFORE the Graphics command.
Good point, the docs are misleading here. They say :
Initially, AppTitle is set the value "BlitzMax Application". However, you may change AppTitle at any time with a simple assignment.
What they don't say is that changing it any time won't necessarily make the least bit of difference if you already have a graphics window open. Yeah, that should be added to the documentation to avoid people thinking it's broken. It's logical once you know, but it's not immediately apparent.