After upgrading to 2.0.32 due to the UDID restrictions on Apple's behalf, we seem to be running into issues with loading data sets.
As a test, I downloaded your sample UDT scene, upgraded it to the latest version of Vuforia (just in case), and added an image data set. Upon activating it, Unity will crash like clockwork when spotting the image target...as it also will running on iOS. This has been tested on two different macs with identical results.
We're running Unity Pro 4.1.3f3 on the latest Mountain Lion.
The XCode Log:
Unity Console Log:
To see it in action, activate/deactivate the included data set in AR Camera (this is the mentioned sample project above):
Any resolve/hack is much appreciated, as we're running short on time.