I think JoannainBristol is as close to reality as possible. Again, I'm not computer savvy. This is my gut speaking. Having said this, today is day two since picking up my BRAND NEW 15" Macbook with retina, which replaced the three-month old of the same with these issues. This morning I touched the trackpad, last night's open Safari page appeared, then within two seconds, it went to sign on screen, but not the desktop sign on screen. The one that gives me the etch-a-sketch effect, and, yes, it did. I was able to sketch away enough grey to find sign on, then had to sign on, then sign on again, then it went to desktop sign on.
If anyone from Apple is really monitoring these posts, please note that I am ready to dispense this computer out the window. Seriously, I could have bought a pc for a LOT LESS. Thankfully it has yet to freeze, but now I'm expecting nothing less given history. What is most disappointing is that I've found posts about these issues from 2011. This is not the Apple we have grown to love. I am majorly disappointed, and being the unfortunate eternal optimist, realize that this is just another corporation making money while we follow the cult. Reminds me of Toyota of earlier years, most reliable car on the market, and then....is no one checking quality control? Just me ranting right now. Do I really want to spend more hours transferring everything from my computer to an external drive, then adding back one by one, even if Apple helps me do it...which they will because I don't trust myself. For $2.0+? The problem is NOT my software, all of which ran fine on Snow Leopard. I cannot tell you how many family I've preached to switch to Apple, and some have. The innovation may be there, and by comparison, the customer service is unmatched, but I want a product that flows seemlessly. You know, like my previous three-year old Macbook.
Ok I'll stop now. But am very very frustrated, disappointed, and will try not using sign on at all to see if this helps.