So after being up for 43 days, I felt it was time to ghost my system.
I shutdown the FD service, checked the HSlog as usual and HS shutdown cleanly. After restarting, I got:

27/08/2013 8:46:14 PM Error (1) Unable to initialize interface Current Cost :Either no license or trial has expired
27/08/2013 8:46:14 PM Plug-In Finished initializing plug-in Current Cost

I had the licenses but elected to go to HS for the latest version. I tried to put in my code and password, but it failed with:

27/08/2013 8:58:59 PM Error Registration error: Bad license file .

Any idea? I've made no changes and have never experience this before....

Rob

EDIT: Took a look into the license directory and discovered the currentcost.lf was missing. I restored from backup and all was fine. Not sure why it was gone but....