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I am currently running Ubuntu 12.10 with Playonlinux 4.2.1 and have installed Oblivion and shivering isles and patch 1.2.0416 and have the game running pretty good but any water in the game is see through and purple!

Makes me think of something I observed in Hitman 2:
http://appdb.winehq.org/screenshots.php?iAppId=1375&iVersionId=26462

As a workaround I had to disable environmental bump mapping in game settings

Edited by petch

What version of Wine are you running?
I got Oblivion to run almost flawlessly!
And it looked just as beautiful as in Windows!

I used Wine 1.3.14 (newer versions won't allow the Securom DRM to run)

Windows Packages:
POL_Install_corefonts
POL_Install_d3dx9
POL_Install_d3dx9_36
POL_Install_d3dx9_40
POL_Install_d3dx9_43
POL_Install_vc2005

Also try Configure, select Oblivion virtual drive, click Display tab:
Direct Draw Renderer: opengl
Video memory size: amount of memory on your video card
Offscreen rendering mode: fbo

Then click Wine tab:
Reboot Windows

I got Oblivion running with resolution 1440x900 and all the settings on high

Fixed since last script update since there is no more need to disable shaders to run the game, thread closed.