Passiebeer wrote:
Suggestion: try next time to see if this happens to you. See if, especially if you have non-saved work, it will go back to normal after some 5-10 minutes. I force quitted chrome, but not sure if that would have been necessary. It just looks it's busy doing something that takes forever, and then returns to normal. So try if 'sitting it out' works for you and post your results.
I upgraded from Snow Leopard 10.6.8 on Wednesday on my mid-2009 Unibody MacBook Pro (2.53ghz/4GB RAM/about 80GB free on HD). Immediately I noticed that appications were taking longer to start up, bouncing for longer in the dock than they ever did in Snow Leopard. Not a huge deal until it started freezing up. I can say that I've had Chrome open almost every single time it's frozen (I do not use Safari). Sometimes I could get force quit to come up either by keyboard commands or the apple drop down menu, but at some point that too would freeze. Twice I was able to open up spotlight to bring up the activity monitor, at which point that would freeze as well. I have always been able to move the mouse around the screen, which has sometimes been the Spinning Beach Ball of Death, but other times is just the usual cursor. I ran disk utility from startup, and repaired the disk only to get a scary message that something was wrong with harddrive and that I should try to back up everything. I ran verify disk after that and than repair disk about 4 more times, but after that everything checked out fine. Since then, I've stopped doing hard shutdowns and would just walk away and let it sort itself out after I tried force quitting programs. I'd come back about 10-20 minutes later and it would've resolved itself, sometimes with a crash note and log, but not always.
I spoke to Apple tech support on the phone on Friday and they had me delete the Caches and reset the PRAM. After deleting the cache (but before the PRAM reset), I was able to reproduce the problem while I was on the phone with them and they could view my desktop with their remote software. Mountain Lion just stopped responding and I could move the cursor but not click on anything in the top finder bar. A few minutes later, just as we were about to perform a hard reset, it suddenly started working again. The only comment that the tech support person made was that it was some crazy lag and that it should not be happening with my hardware. Hurrah. Today, I had the same thing happen again - only this time, the compter froze for 16 minutes (I could tell because the clock froze as well), before suddenly coming back to life, and everything responding at once to all of the clicking/keyboard commands I'd tried earlier to get things to force quit. So far it's happened a few times while I've been trying to load a new webpage in Chrome - it often looks like I've lost my wireless connection and it's going to time out, and the tab will have the loading icon on it and then suddenly freeze. However, Chrome was not open at all the time it froze while on the phone with tech support, so I'm not inclined to blame it. I think it's a common denominator because it's the one thing that I am almost always using.
I backed up with time machine before I installed ML, but I'm hesitant to go back. I recently bought an iPhone and was looking forward to syncing To-Do lists and Calendars, and since I never bought Lion when it was in the App store, it's now unavailable to me as an option. However, ML is ridiculously unstable right now, and prior to this my computer was remarkably dependable. If I wanted to go back to SL, I'm essentially going to have to reformat the HD anyway at this point, right?