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Hi Felix, I hear what you're saying, but I just ran 
through it again with a clean boot.
Running Mac OS X 10.4.10 and at boot time, I load 
remote buddy 1.1, dvd pedia 3.6, yahoo widgets 4.0.3 
x178.
With the Kernel extension installed (ver 1.4.5) and 
when I'm in DVD Pedia full screen mode (play toggles 
me in and out of this mode) when I hold play (custom 
action), I get the issue where it launches DVD Player 
but the screen keeps flashing and no matter how many 
times I quit or force quit dvd player keeps 
relaunching and the movie does not play, I also get an 
error message beep.
With the kernel extension uninstalled, the behavior 
seems to be fine, in that when in full screen mode in 
dvd pedia and I hold down play for a few seconds, it 
launches dvd player and plays the movie, no flashing 
or other issues and when I quit dvd player it all 
behaves normally. Of course I get occasional conflicts 
with front row.
Any help would be appreciated since I need both remote 
buddy and dvd pedia to operate my mac mini as a media 
server for movie watching!
Gaurav