Quote Originally Posted by Papewaio
Don't need a ships as England has a connection through Flanders. Sounds very weird, might have tripped some sort of random thing.

So the King has no vices, not ex-communicated, won all battles recently, hasn't stripped any generals of titles and isn't using his princess to marry his princes?

What version of MTW? 1.0, 1.1, VI etc

Are these events happening in the same year?

Plague or anything else... it might be a bug...
Land connections decline quite fast in strength, entire Spain would rebel for example with a loss of shiplines.

It does sound like a war messing things up though, maybe the enemy got one boat that he's swapping between two provinces.

It's not an attack with the king either, with those everything is green before and after the turn, but almost the entire kingdom will rebel in between.

Or else Pape is right, you've encoutered some wierd bug, but most likely it's somthing you missed.