Could be my Avast anti-virus software although no 'threat' pop up happens when I open the latest beta. I'll try adding SGP to the exclusion list within Avast and see of that makes a difference, doesn't explain why 2.5.2.1 works though. I'll do this tomorrow when I've finished imaging tonight.
I can always try completely uninstalling SGP after backing up my profiles if all else fails . . . Ken/Jared I may post for help if I have to carry this out and it screws up my registration.
Barry