I recently exported a Unity package from one vuforia project into a fresh project. I re-imported all qcar scripts afterward as well. When I try to build to device, Xcode's architecture is not set to armv7 only. It then has issues compiling for armv6. If I manually changed the architectures under Build Settings to Standard (armv7) it builds fine. Any idea why it keeps trying to set it to include armv6?
Are you using Unity 3.5.2? Sometimes Unity 3.5.2 projects can become corrupted in XCode, resulting in linking errors for a given arm version.
If so, I'd recommend deleting the XCode project folder and starting fresh.
If this isn't the case, please tell me which Unity and Extension versions you're using, and you might try w/ a fresh Unity project by importing the extension first.