"Haxies are a source of controversy among Macintosh software developers. Because haxies make changes to Mac OS X that Apple did not intend, they complicate the operating environment for other developers' applications, and are frequently the cause of system instability and unexpected crashes.[1] Applications by Bare Bones software display a dialog after crashing (or are force quit by the user) if haxies are detected on the system. The Omni Group routinely asks users to remove Application Enhancer modules before contacting customer support for help with their applications.
According to a post by an Apple employee on an Apple mailing list, Apple ignores all crash reports submitted by users if they show that APE is installed."
"Reports abound regarding users suffering from a “blue screen” after upgrading to Leopard: they upgrade, reboot, and get stuck at a blank blue screen.
But, as far as I can tell, there is no mystery involved. There is one and only one known cause for this problem: old versions of Unsanity’s Application Enhancer, a.k.a. APE. Versions 2.0.2 and 2.0.3 of APE are apparently inert but harmless on Leopard. But at least some, if not all, versions of APE preceding version 2.0.2 are incompatible, and will render the system unbootable if left in place during an upgrade."
