I've found Haze to be the most unstable following a cut from GPRS to wifi or the other way round.

It gets 'Network Errors' all the time and refuses to 'connect' although I'm not sure if it has actually connected and I was in the same position as you.

I tend to just have two MSN 'accounts' one is Haze, not sure what the other one is, if Haze refuses to connect, the other one is usually fine.