This might be a particular crash that we've been seeing reports of for a while. I've put in a workaround that will be in the next version 0.6.0.
If you want to try right now, you can try going into your BitShares data-directory and deleting ONLY the folder "peers.leveldb". If you do that, let us know if it fixes the problem.
That worked. Thank you. Keep up the good work.