thats weird anytime my comp crashs while mint is running it seems to f up the block chain, so I end up downloading the most recent bootstrap to re sync with a brand new wallet.dat (after saving my real .dat) and it always sync's right up no problems
Or you may want to do this... But if the block chain is increasing then it means its working. My guess is its devoting all resources to that instead if updating GUI that is why it says not responding. Since it might take a couple more days to sync, u probably should just let it do its thing and ignore it for now. Or if you are in a rush, do the bootstrap method mentioned.
Every time mintcoin starts on my machine it takes a seriously long time to respond. So I don't think this means it's broken. Maybe let it run for a while and see.