So I'm experiencing the same crashing issues on my iPad 3, specifically around opening a folder and having the app force quit.
Something I have noticed: When I've setup some transfers in "Best" quality, and the app crashes, the transfers will still be there on re-launch but showing the "Good" quality file size on the transfer screen. If I let the full download occur it does indeed stop at that point, and the playback indicates the same file size/quality.
I can replicate this pretty easily; just start a transfer on best, get the app to crash (for some that seems to be easier than others), then re-launch and review the file size of the transcode.
Anyone else seeing this? Is there some reason that could actually be by design on the stream?
I'm on the iPad 3 ATT version, running iOS 6. The steam is indicating S/W version 19.0.1-01-06.