I'm curious whether anyone else has seen this ... iMac 9,1 (early 2009), 8 Gb, SSD, upgraded from El Cap using dosdude1's patcher. I upgraded the existing installation rather than doing a clean install. Upgrade went fine, everything seems to work, *except* the App Store. If I go into app store under Featured or Top Charts, I can move around, click on an app to look at the description, all works fine. If I click the Updates tab, I get about a half-spin of the activity wheel in the window title bar, then it freezes. The only way out is to force quit. Activity monitor says that App Store is doing something, but only a very very little bit of it, and no other process is obviously spinning or using CPU. I've tried all the voodoo I could find on the net: put Bootcamp into spotlight exclusions (!!), delete various caches, run it in safe mode, etc. Nothing helps. Interestingly enough, as I was poking around in Terminal, I tried "strings foo.bar" and was told that I needed to install the command line tools. Fine, I click on install, and *that* froze as well. (In that case you don't get the pizza of death, but nothing happens, and the Stop button doesn't do anything, and I think I had to force quit it to exit.) Has anyone run into this? and, what would be common to both app store update and the command line tools installer? General networking seems to be OK (mail, web, etc), and in fact it (sometimes) seems to get far enough to discover that I have three updates to install, but that's about it. (I poked around in the force quit report for a couple minutes, but didn't see anything obvious other than the fact that all of the app store threads are waiting on something or other.) If nobody has any ideas, I guess the next step is a clean install; but that will have to wait a couple weeks until I have a day to screw around with the machine again. Full backups move a bit slowly (USB 2) and I'm not about to run a clean install without a full backup first... edited to add one more symptom: if I click on the Store menu item, it freezes immediately without showing the menu. I can however access the iTunes store just fine, so it wouldn't seem to be generically apple-store related.