Hiho everybody!
I did already mention this in the "announcement thread" but since it seems to have gotten lost in there, now in an own thread:

I do have some problems with screen corruptions in UT2004 when using the 8.42.3 driver. The problems do only occur in rather big resolutions, small ones like 1024x768 tend to not have those problems. There was no such problem when using the 8.41.7 driver. Downgrading xorg-server to 1.3.0 did not help either.

And here are my specs:
c2d 6400
radeon 9800pro (agp but without pcie bridge chip)
gentoo x86 (unstable)
xorg server 1.4.0
*no* aiglx

the relevant part of xorg.conf:
Section "Device"
        Identifier      "ATI Graphics Adapter"
        Driver          "fglrx"
        BusID           "PCI:1:0:0"
        Screen          0
        Option          "MonitorLayout"         "TMDS, NONE"
        Option          "AGPMode"               "8"
        Option          "RenderAccel"           "on"
        Option          "AccelMethod"           "xaa"
#       needed for fluent usage of tvtime
        Option          "XAANoOffscreenPixmaps" "true"
#       r300 driver options
        Option          "EnablePageFlip"        "true"
        Option          "ColorTiling"           "true"
#       fglrx options
        Option          "VideoOverlay"          "on"
        Option          "OpenGLOverlay"         "off"
        Option          "UseInternalAGPGART"    "no"

Section "Screen"

        Identifier "Screen0"
        Device     "ATI Graphics Adapter"
        Monitor    "Dell2405FPW"
        DefaultDepth     24

Section "DRI"

# Access to OpenGL ICD is allowed for all users:
# Access to OpenGL ICD is restricted to a specific user group:
#    Group 100    # users
#    Mode 0660
        Mode         0666

Section "Extensions"
        Option "Composite" "Disable"
#       fglrx-only for xvideo (tvtime)
        Option "XVideo" "Enable"

Section "ServerFlags"
        Option "AIGLX" "off"
And here an example for the corruption:

This problem might be UT2k4 specific, at least I did not see anything like this in other games (like Neverball). Beside this problem the driver works rather good for me (okay, it crashes often when quitting xorg and xv diaplay (resizing) is a little "blocky" with xv like it is used in tvtime, but those two problems are nothing new, they are long standing).

If you had the same problem and know a way to fix it, I would be really happy. Or am I the only one with exactly this problem?