I think I know why this is occurring, out of curiosity do you have a firewall active or did you prevent any outgoing connections from the app? I have since fixed a crashing bug related to 'non-data' coming in from Bittrex.  So this will be fixed in the next update.  This can happen if a connection failed to Bittrex for example.  Expect the fix to come out probably right after PoSA, but Cloaktrade does work otherwise.