Sorry if I confused things!

I did a couple of posts that I subsequently deleted because in the meantime I had contacted PG Support and it seemed to make sense to let them have a look before making any further comments - not that I had much of use to say anyway - frustration was kicking in!

Anyway, they responded very quickly and set up a remote access session to my computer. Problem not yet solved, but ongoing and hopefully will be soon!

I do actually need low latency for some things I do, which is why I'm keen to pursue it. As I had said in one of the deleted posts, up until recently it has worked perfectly on my system, at least for the last three years.

I really do value all the help you have given me on here and if there turns out to be a straightforward answer that I understand, I'll let you know.

Many thanks again