Got mine an hour ago and so far no crashing yet, just super smooth UI awesomeness...hope I haven't jinxed it! The software version is 10.2011.23-1_PR_001, I'm going to update to the latest version before doing anything such as enabling developer mode.

To open the USB cover there should be a sticker on one side saying "1 push" - you push down on the side closest to the headphone jack and the other side pops up.