SharePoint Issues post service pack /Cumulative updates or if you add or remove a member to the SharePoint Farm
I have had those in the SharePoint 2007 years but didn’t expect that with SharePoint 2010 the DEC 2011 cumulative update.
But here is a way to fix it
(run from the command prompt at the 14\bin\ as an administrator) or better, run the SP management PowerShell console as administrator and run the following command)
Note: the command is harmless but the farm might not be accessible during execution.
It performs a forced upgrade and that should clear all errors on Central Administration or any others encountered during the configuration wizard upgrade.
psconfig -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures
This phase may take a while (depending on how large it your databases)
Make sure you are able to get to Central administration after this task completes
This has been a life saver in many cases
Best of luck