I have more or less the same problem. Tried withe tree different internet connections, that all worked before. Seems to coincide with the latest Mac 2.0 viewer update.
Problem only with my main avie with lot's of clothing attached...a simpler avie starts up without problems.
I'm totally clueless...did try lowering graphics quality...clear caches, etc, but it crashes every time with the "Darn. ...." message