If it's Wednesday, there must be a new beta of the forthcoming OS X Mountain Lion 10.8.5 for developers to test. Apple has issued build 12F17 -- once again only four builds higher than the previous release -- for testing by program developers and, most recently, Apple retail store workers. As has been the case with the previous betas, no known issues are listed and testers are asked to focus on Wi-Fi (including new 802.11ac testing) and the "wake From sleep" function, both of which have seen issues for some in Mountain Lion.