Upgraded to 10.10.3 at the end of the week, and this is the first time I've ever been truly frustrated with an update. My new MacBook Pro Retina (13") has gone from flawless operation to buggy and slow. I've had numerous kernel panics (including one that panicked a few times while rebooting from a panic), my wifi menu is no longer accessible (clicking on it locks up the SystemUIServer and I have to force-quit from Activity Monitor), and Preview.app now crawls when viewing PDFs. My fans are also on constantly, and the computer runs hot even when I'm doing nothing more than posting a comment on this site. I need to downgrade back to 10.10.2, but would prefer to do so without wiping the users (since it took a while to get them set up properly). If I do a recovery install without wiping the drive, will it preserve the installed applications and users? Any concerns if I have FileVault active (i.e., do I have to deactivate FileVault before attempting the downgrade)? Advice is much appreciated... Thanks!