My Messages (iMessage) app started acting up, it basically didn't show anything other than one single old conversation in it's own window, instead of the conversation list, and I couldn't bring back any other windows than that one conversation, no matter what menu bar items I clicked, that was still all that it wanted to display. Strange. And the conversation itself didn't work either, just for the record. So the app was probably just totally crashed. But hey, that's not the issue anymore. I just decided to delete the app entirely... Now I just want it back, so is there a way to maybe restore apps from the install file for 10.9? Thanks for any input!