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I remember having the very same thing on my G4 400 when I first set it up with PTle. Originally, I did as the manual suggested and installed PTle with Mac base extension set. It was after I had installed PTle that I went and disabled unneeded printer extensions and a few others I didn't think were necessary. The solution was that I had disabled too many supposedly unnecessary extensions. Unfortunately, I can't remember which extension I had to enable to fix the problem. Basically, I went through the ambiguous ones and enabled them one at a time until the problem disappeared. It was a tedious process but it fixed the problem.