we get crashes on Vumark dataset loading with attached Vumark dataset zip. Also attached is our DatasetLoaderMinimal class (as text) that does reproduce the crash. The other setup is Unity 5.3.7f1 (same crash comes with 5.5) and Vuforia 6.2. Xcode is 8.2.1 and crash happens on various IOS versions, both on pads and phones. Works on android and loads dataset with image targets without any problems.
Tricky part is that crash happens occasionally, around every 5th time app runs, always on same call in Vuforia (see screenshot).