Dear Mac experts.......i've got a question about Quicktime:

when i open up an .avi file with quicktime....the window starts becoming smaller and only stops doing this if i click on full screen.. Any idea WHY it is doing this and any idea how i can stop it doing this?

ie....if i open it up to actual size or double size (anything other than full screen) starts to become narrower and narrower...until it is about 7 cm long...strange....don't you think?

many many thanks from a confused apple user!