If you use Fluid.app as an SSB (site specific browser) for Facebook, on OS X 10.10.x, you may have noticed some display issues. Here’s how to fix them.
Bluetooth failing and having issues after your Mac comes out of sleep? This is a known issue reported by OS X Yosemite users. Here’s a solution that will likely resolve it.
Hide your Mac OS X username from the login screen. It’s a simply security measure I recommend for people with laptops especially. Here’s a couple of free and easy ways to do it.