Solution for: #98: "Pattern colors are not supported" when compiling iPhone app

Open the problematic XIB file in Interface Builder. Go to Window -> Document Info. There you should see two additional development and deployment target settings, specifically set for the XIB file. At some point these appears to have been set for this XIB file to iPhone OS 2.x.

Resetting these to "default" rather than their fixed settings solves the problem handily.