Doh!  Should not have installed KB 274....  Over-zealousness just bit me on the...   The migration fix removed the files... now to see if I can get the Dll's registered manually, otherwise it is back to the old re-install.   Thanks 

Hi We recently upgraded to 0803, and experienced some problems, so we tried to install all the KB's that are available for 0803 on the K2 portal site.  After installing KB's 206, 271, 274 and 279 we rebooted our server, and now Workspace does not work. We get the following error: Could not load file or assembly 'K2Worklist, ...

I'm having the same problem, did a clean installation of blackpearl 0803 and the service stops after a few seconds.  Did anyone solve this problem? Thanks