Missing 3D Views

[joell]

Not sure what happened, but I'm working here with two viewports (2D and 3D) and out of the blue, the 3D image simply stopped working. Nothing shows even when I try REGEN or reopen the file. The 2D image works fine and *sometimes* I can rotate it to show in 3D, but if I use any of the preset isometric views, nothing shows.

Any ideas?

[RibbonHater]

Are you by chance working in windows 7? I have seen some similar issues with win 7

[joell]

Nope, Windows XP x64. Video card is updated to one suggested from the Autodesk forums.

[mike.gustus]

Does it happen in one particular file or every file? I think I have seen similar behavior and I think it had to do with 3D clipping planes being out of whack. Try copying everything to a new blank file and see if it helps.