@AlicePPC
if you are under CGX, try to remove/rename the Ghost.iff and Backdrop.iff inside the IFX directory.
Then goto IFX Preferences settings>Modules/Preview and pick "WindowedCGX"
ah and ofcourse, you have to setup "some" other things here and there (virtual memory, the right loaders/savers)
As per usual, better to post here your full configuration (on what AOS version, amount of mem, RTG and such)