This only happens with OSX updates, all general apps work fine.
I click install to update to the latest version, I get a couple prompts confirming I want to download and allow my computer to restart. Then nothing actually downloads, it gets listed as recently installed but also shows in my updates available section too.
After checking the logs, I found this is more than likely a permissions error.
Does anyone know what user groups + folder permissions the updates require for OSX? I've run the health check etc on my drive and all seems to be fine.
Because the log is quite long, I've made a pastebin.
http://pastebin.com/4DeRUBzh
Edit:
I'm running El Capitan, but this issue has persisted since upgrading Yosemite.
I've tried resetting Home folder permissions & ACLs, this did not correct the issue.
Best Answer
This worked for me in Mavericks. My App Store app wasn't responding and someone suggested resetting the NVRAM. It's done the same way as you used to reset the PRAM - during Restart, hold down p+r+option+command until you hear the startup chimes a second time, then release the keys. Can't hurt, anyway.