You have been quite lucky then, I have noticed a number of programs including a few magmic games and some other stuff that stopped working once I went beyond 3.7.1.

As far as the resolution, increase or decrease won't make any difference if its hardcoded for just the one resolution or expecting to use resources at a particular resolution e.g. brickbreaker references a resource file that includes the screen res in the filename, thats one that wouldn't work if it was simply tried on another screen.