Slate Digital plug-ins blacklisted!?

Well I’ve reinstalled Slate buss compressors but it makes no difference, They’re still blacklisted, they still won’t Reactivate and they are still 64 bit only. I don’t get it. last week they were working fine but are now blacklisted for no apparent reason. And another oddity is that others with the same set-up are not experiencing the issue. I got the same advice on Gearslutz… reinstall the plug-ins, though all that does is replace them with the same dll’s

There must be a reason and somebody, somewhere must know what it is!?