Previously, it was relatively easy to explain: Greece is bankrupt and we don't know what to do about it. But then we bailed Greece out and it's still not over. Now it's something along the lines of: Greece is bankrupt, but then French and German banks own Greek debt, so they might be bankrupt too. Then Italy has lots of its own debt, which Germany would like it to pay off, just in case that markets start worrying that Italy is bankrupt too.
And that's before we even get into the the proposed solution (mostly it seems to be that Germany should throw money at everything, which the Germans understandably aren't too keen on). How big does the bailout fund need to be? Who pays for it? Who do we (well, the Germans) bail out: the Greeks, or the banks? Should the European Central Bank be allowed to buy government bonds? No one is sure of any of this. Not even the people whose job it is to understand it.