Running 3.5.1 without problems. I recently noticed that I have 7 plugins that say they have updates and never had a problem prior to about a month ago. I checked my activity logs for changes I've made, disabled the new plugins only, no luck.
Example: Jetpack being one of them; I was at 2.2.1. I update it to 2.2.2, it shows successful, but when i refresh the admin (even from another machine) it shows it at the older version. If I pull up a list of all installed plugins, then move away from that page it doesn't show the updates anymore. But if I cruse around some more, it comes back saying I have 7 new updates. All 7 plugins show successful but do the same thing.