After 3.1.1 upgrade, auto-update of plugins went away

Hey there. So, I updated to 3.1.1 from 3.0. Before upgrading I noticed that several plugins also needed to be updated. After the upgrade, however, WordPress no longer indicated that plugins needed to be updated, when in fact they are out of date.

I’m not too concerned, since I have everything backed up with VaultPress, but I was wondering how I should go about troubleshooting this. Should I re-install 3.1.1 using the “re-install automatically”? Should I manually install each out of date plugin one by one and hope that it’s a fluke?

Thanks for the help.