How about being attacked from the sea, I swear I haven't had it happen to me once, pre and post patch, with dozens and dozens of game played...
I just had it happen to me on my game, Prince level, Hemispheres with Random # of continents (it turns out there were 6), Standard map; v3.13. Shaka invaded me from overseas. Declared war, brought in 4 Galleons fully loaded, and took over a city.
What is annoying is that I, as AP resident, and current elected official, could not even vote on a resolution to force Shaka to go to peace, or to give back my city. Granted he would have just defied the resolution, but c'mon... he declared war on the current elected official of the palace--that's the time to put up a vote! Then he could defy the resolution, which would allow me to have the rest of the full members to declare war.
I also have never seen the AP resolution to have all Full Members declare a defensive pact with each other, even when all members are at peace with each other (which I would assume is the prereq).
Despite some quirks mentioned (and apparently fixed unofficially), v3.13 definitely is an improvement in my book.
The patch was done coding on September 21? Alexman was right to the best of his knowledge, apparently. It does look like either Firaxis or Take2 needs more playtesters. I'll volunteer! I'm even in the Baltimore area.
Sam