I found that this worked, having had OpenGL errors with Sketchup in Wine, changing wine's fake windows registry (type 'wine regedit' into your terminal), navigate towards each of these three. By version 8 I think that the middle one has disappeared, but a combination of changing the others has allowed me to get sketchup to run. I suspect that changing HW_OK to 1 is the main one.

[HKEY_CURRENT_USER\Software\Google\SketchUp6\GLConfig\Display]
"FIRST_TIME"=dword:00000000
"HW_OK"=dword:00000001

[HKEY_CURRENT_USER\Software\Google\SketchUp6\Google SketchUp TOTD]
"HelpPage"="0"
"ShowOnStartUp"="false"

[HKEY_CURRENT_USER\Software\Google\SketchUp6\SnappyInstructor]
"Show"="0"

To change the value to the right of the '=' sign, click right in 'wine regedit', modify, type in the value (1 or 0 in these cases)

Don't be afraid to post queries, registration doesn't take long on this forum (i registered just to leave this post)