After the latest patch I can run the game. When I go to switch arenas I get the aceshigh.exe has stopped working box.
Win7 64 bit
Only thing that has changed is the version of AH.
What I highlighted is absolutely not true. Microsoft issues background updates to Windows 7 all the time and they do not tell you about it. They are quietly installed on your computer. Also note, visiting a WEB site can change your computer behavior or installing another application can alter the operating system as well.
There really is no way of knowing exactly what has changed with a Windows based computer. The only way to prevent it from changing is to disconeect from the Internet and never install an application.
The error you are describing could be due to a number of things. One thing to keep in mind. If the game exits abnormally, there is a fair chance something will get corrupted in the game config files.
Rename the following folders in the game installation path.
settings
skins
sounds (in case you have any custom sounds)
ahiiterr
After that, install a fresh copy of the game, over the current installation and try it.
The fact you are having problems with the TrackIR software says something has changed on your computer. Is this an HP computer with a Bluetooth driver installed?