One address in multibit - very simple. Other addresses online and not at issue here.   

Blockchain balance is as you say ... 27.26794131 BTC in unspent outputs.

I have not seen anything go out.  Perhaps because I saw it so fast .. and reported it here so fast?  If it is a software problem, well, that we can fix yes.   But so far, no fixing has worked.  We'll wait for multibit to say their say.  I'm happy that I am not in their shoes ... if someone came to me for tech support on this, I would be really suspicious.