I’m having the same white window problem on my MacBook Pro.
Installed FCP 7 (upgrade from FCP 6), running OS X (ver. 10.5.8), 2.4 GHz Intel Core 2 Duo, Quicktime Pro ver 7.6.4 – getting white screens in FCP viewer and program monitors no matter what media formant or still format. Videos play fine in Quicktime.
However, if I select from the program or viewer pull downs: Alpha & RGB – I can finally see the footage but with the normal red alpha tint overlay.
Additionally, if I pull the white screen footage directly from the viewer into the timeline, during the drag I can see the footage thumbnail as it should be – but the footage plays white as soon as I place it in the time line.
Occasionally, I get a weird “8-bit like” image displayed in the viewer as if the footage is solarized.
Also notice same white issue in Motion.
My FCP and FCServer support folks have tried trashing prefs, complete uninstall and reinstall. Complete uninstall of Red Giant Plug-ins (Primate Keyer, Magic Bullet, Colorista). Ugh! Nothing seems to fix it.
Any thoughts?