GP Work Center Runtime keeps crashing

Hi everyone!

I have a strange problem which has cropped up in the last week or so. The problem is that whenever I start a GP process (in the UWL as well as in the GP runtime itself), I get a message in the NWA that the WorkCenterRuntime has expired and that I should start it through the link (then the link for the WorkCenterRuntime).

This is not a problem because of a custom GP Process or anything, the WorkCenterRuntime crashes even when I start the example processes from SAP too.

In short, first an Info where it says "Session Expired blah blah blah" then comes the Fatal message saying that the Web Dynpro Application "WorkCenterRuntime" has expired and I need to start it from the following link..

Then comes a HTTP request error because the session has expired and finally some strange "getAllInstances:null" error.

The settings in Visual Administrator have NOT been changed (I am the only one working on the test system) so I really have no idea what went wrong.

Thanks for looking into it,

Sameer