OK, Looks like I solved my problem. I am posting what I did here in case it helps anyone else with the same problem.
Over at Mac OSX Hints, I found the following post:
http://www.macosxhints.com/article.php?story=20070916123611119
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+"I have experienced this problem several times in the past few years, both on a G4 PowerBook and Intel iMac. For no reason, Safari will stop updating my RSS feed counts in the Bookmarks bar. RSS still functions and will update whenever a particular feed is selected, but the parenthetical numbers for each feed or folder do not change.+
+The fix is simple and doesn't hurt any of your RSS subscriptions. Just quit Safari, remove the Database3 file located in ~/Library » Syndication, and then launch Safari again. I move mine to the Desktop and trash it only after I've successfully restarted Safari and confirmed the problem is fixed. Safari will create a new file in its place.+
+Easy enough, but I've never seen it anywhere else online, and have forgotten it myself a few times."+
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So I followed this and moved the database3 file out of the ->Library->Syndication folder, restarted Safari, and now RSS seems to be working normally.
By the way, instead of deleting the database3 file,I just moved it to the desktop, until I can confirm that everything is working correctly, and I will delete it later.
Hope this is of some help to you if you are having similar RSS problems in Safari.
Martin
Message was edited by: Martin Weir