Star Trek Online, ranging from irritating interface bugs on ship consoles to the apparently frequent bug that causes the holodeck to nearly kill everyone on the ship every few weeks. They also crop up in the game itself, of course, but as outlined in the latest Path to F2P blog, the development team is focusing in closely on trying to eliminate several bugs and design issues currently in the game.
Patrol missions, for instance, are being changed from a flat sequence of isolated system missions into a more freeform system that scales with level. Crafting changes are also being put in place, giving players "material blocks" to work with that are purchase via dilithium, thereby allowing fleets and groups of players to shunt crafting resources toward a single player. The entry also hints at an entirely new form of content coming to the test server over the next month, although players will have to wait to find out what that means.
[Edit: More details on the F2P switch have also surfaced, thanks to our friends at IGN.]