And another thing!
Tried to log onto PpruNe, and couldn't. I could look inside, but not log on. The horror!
I ended up getting a new password...after all these years with the same one. That fixed it, but it was definitely related to this installation, cos PpruNe was working normally on the other drive. Odd that.
I tried deleting the cookies etc. Ran CCleaner. Made not a jot....