have you ever observed a problem with the Powerbook G4 display as follows?

Under Mac OS 9, open WORD 5.1
then regardless WORD 5.1 is still open or already quit, open PageMaker 6.5
the display opens with largest magnification, which cannot be altered within the PageMaker program.

how to overcome the problem?

before opening PM 6.5, switch the screen resolution and swith back to the desired resolution. Then open PageMaker. It works fine, but don't ask why.