Hi, so when you opened prefs. in DVD Player, play when dvd is inserted and open when dvd is inserted were checked or you don't have that menu?
Okay I have player opens: start playing then under...When inserted: start playing.
I had a problem with Tiger's DVD player closing on its own.
I finally took off Tiger and went back to 10.3.9. I find Panther much more stable for doing real work.
I had numerous issues on my G5 imac including the fans spinning up to max, losing the mouse, where I had to plug and unplug, safari malfunctions, frequent slowdowns and poor networking with my Linux and Windows boxes.
The DVD player was also closing frequently on its own.