I have just upgraded from version 2.0x to 2.5.1 and the widgets are not showing as installed on the Installed Widgets sidebar. It is the same with every theme. If is is a three column theme is gives the the drop down to show sidebar 1 or 2 but there is nothing underneath it. All available widgets show in the left hand menu and I can click Add. Then it just changes to EDIT but still nothing shows in the Current Widgets side nor is there a Save button. If I click on Show used widgets it says no widgets are currently installed though all the regular widgets show up on the site itself. Archives, Blogroll etc. I have looked at other posts about missing widgets but cannt find an answer that works so far.
Any help would be appreciated.