I had assumed that Apple Support Communities would be against Onyx, because they are against everything that doesn't come from Apple, and they like to argue too much for my taste. Anyway, I used Onyx WITHOUT THEIR PERMISSION, and it worked. It worked sensationally. I had had a couple of problems that they couldn't help me with, so I called Apple Care. They couldn't help me, either so, having nowhere else to go, I tried Onyx, and not only did those two problems disappear, but also another one that I had resigned myself to. Wonderful. Even better, Onyx fixed the problems even though I had no idea of how to use it. I just saw a command that said something like "Restore all defaults," so I chose it thinking that it could do no harm. THAT DID IT. I'll never know which settings had been causing the problems, but using the DEFAULT command brought my iMac back to its brand new condition. Thank you Onyx. I understand you need contributions. Well, you're getting mine within seconds. Thanks again.