File system auto-protect is malfunctioning, only difference is, Eraser: 0.0

Hi, I have a number of machines showing that the file system auto-protect is malfunctioning, I've spent a few days going through that the problem could be and I've hit a brick wall.

The only difference betweeen a working and unworking machine is the Eraser engine showing as "Eraser:  0.0" on the malfunctioning ones.

They're 2008 R2 machines, SEP EE 11.0.x,  RU7 MP4  11.0.7400.1398

I've tried almost everything I can find on the forums etc, but nothing seems to make it work, if I switch them over to another management server running  11.0.7000.975 they're fine.

Help!!!