Ok try logging out, then closing your browser, deleting the UKWorkshop cookie (stored somewhere in you profile eg. C:\Documents and Settings), then relaunch your browser, surf to ukworkshop and log on with the box ticked.
That should solve it. If it doesn't then it maybe either a problem with your browser or your computer. But this is unlikely and sounds like a dodgy cookie.
I wonder how many dodgy cookies cookie monster had and whether that's what turned him into said monster? I don't know but can you tell me how to get, how to get to sesame street?