I am not sure if this is class/race specific or even if this is affecting others, but since the last patch, there has been a skill activation bug where after jumping activating any skills at all does not work until weapon swap.
Just to throw the details out there, I am playing on an Asura Guardian. The problem persists with the Sword, Staff, Hammer, Scepter, and Greatsword. This bug is really frustrating and takes the player out of combat completely. Many players I have spoken to have just decided not to play until Tuesday in hopes that some of these bugs plaguing WvW get fixed in the patch.