Although this is resolved, it hardly rates as Tips&Tricks so it's in this forum.
Problem with getting screen resolution to stick.
R5 on desktop PC, C2D (2.93) cpu, 2GB RAM, nVidia G98 (8400GS) card, Samsung T200 widescreen monitor, "full disk" install
On install, R5 allocated ATI-3D driver (?!); added nVidia drivers and card was recognised, plus available resolutions added.
Could use Monitor Settings to get 1680*1050, but this is lost on reboot despite using Apply and Save.
Startup sequence was a few compressed coloured lines on black background, followed by login screen (full width) which works. After login, desktop with icons and bottom panel appeared promptly at 1680*1050, then disappeared to black, then the desktop reappeared at 1024*768 and not full screen width; some time later, bottom panel and icons arrived.
Could easily change resolution again to 1680*1050, but it didn't stick.
Strange - I've installed wattOS on multiple PCs and never seen this; I assumed a bit of simple research would solve the problem.
Web'pertise suggests using xrandr (plus switches) in Terminal, or adding a line to /etc/xdg/lxsession/LXDE/autostart . (IOW, the same advice as in these forums for R3 with a few more options.) This was not successful.
This is all past tense because I happened upon a fix.
Was having a look at tray icons (after fixing the clock for local format), and found Jupiter. In its menus is one for screen resolution. Selected 1680*1050 and it's been stuck at that ever since.
In essence, compared to the description above, at boot the desktop now stays and doesn't disappear to be replaced slowly with the lower resolution version.
What was the problem ? Source of the problem ? Not known - maybe user error, maybe not.