And unfortunately, MtGox is not very open about this issue. For example if you ask for a monthly/daily limit change for USD withdrawal, they will just approve you without saying that BTW all of the withdrawals are currently impossible.
So everybody is just guessing around if they are insolvent or this is just a temporary hickup. Since they already survived a lot of previous issues, this might be temporary. But there are good chances that it's not, so be careful!
I think these problems really do have the potential to downgrade MtGox' importance in the bitcoin environment at some point in time in the future
It's just a big hassle.