Many "3D" screen savers render in full screen preview such that objects expected to be behind other objects are rendered frontmost. This does not apply anywhere else. To reproduce:
1)System-->Preferences-->Screensaver
2)Select a 3D screen saver (I have "lattice" and "endgame," but there are many others that I have as well, all broken)
3)Press "preview"
4)When starting the screen saver manually through "lock screen" or naturally, there will be no problem
Not sure if this is dependent.
May be dependent upon having the following graphics controller:
Mobile 915GM/GMS/910GML Express Graphics Controller
Note: some of the comments may not make sense with this edit, so here's the last version summary: lattice screensaver fullscreen preview draws close objects behind far objects, and its description: It always appears as doughnuts in the preview, but not when I use "lock screen". It looks like this in the preview, but there's no problem in the screensaver itself and this is only in the fullscreen version. I do not know if this can be reproduced easily. Here is a screenshot (attatched in first comment). This is in feisty fawn (7.04).
there is no problem when waiting for screensaver to activate on its own either. It works normally and looks fine.