Thanks for the replies. I figured my Flash had been updated to a newer one that wasn't working so well, looks like I was wrong there. Maybe it is linked to me changing my graphics driver, I'm back to the supplied one which is older than the one that was installed until a few days ago. Trouble is I have absolutely no idea which release it was, DOH!
To give you an idea how bad it is, my meter always moved towards the ding line as a single, vertical faced line. Now I can often see the leading edge being drawn, it looks like an avalanche going along my screen. I'm still posting OK scores but am missing at least 1 putt per 9 holes due to missing the ding on putts. My ding rate has gone from an estimated 80% to well under 50%, probably about 25% more likely.
If I had longer hair I'd be pulling it out by now. I'll try the suggestions above and let you know how it goes, it can't make things any worse. Hopefully.