Bare Bones Software has released a nifty little utility for those using Apple's DVD Player 2.0 software along with MacsBug. DVD Player Helper allows these two programs to run in harmony, eliminating an error message generated when attempting to use the two applications simultaneously. According to Bare Bones:
Apple introduced version 2.0 of the Apple DVD Player software. This version (and subsequent releases) of the Apple DVD Player do not require DVD decoding and playback hardware in order to play DVD video disks. However, at the same time, Apple introduced a limitation into the DVD player: if you have MacsBug (Apple's machine-level debugger) installed, the Apple DVD Player will display an error message, and then exit.
If you're a developer, and you use your machine for both software development and recreation, the error message is probably frustratingly familiar.
Until now, the only way to watch DVDs using the Apple DVD Player has been to remove MacsBug from your system folder, restart the machine, watch your DVD video(s), put MacsBug back in the system folder, and restart the machine again. An inconvenient process, to be sure.
The DVD Player Helper performs exactly one function: it allows you to use the Apple DVD Player software to watch DVD videos on a Mac on which MacsBug is installed. The Helper is for use on the Power Mac G4 AGP ("Sawtooth"), FireWire PowerBook ("Pismo"), and iMac DV.