/feed/ URL not rewriting to RSS feed

Hi,

Upgraded from 1.5 to 2.02 yesterday, which has been a complete nightmare. I’ve got it all working, sort of, but the /feed/ URL isn’t rewriting to the RSS feed. This could be because I installed the Feedburner plugin (https://www.orderedlist.com/articles/wordpress_feedburner_plugin/)

If you look at my blog you’ll see what I mean: https://www.cricket.mailliw.com/feed/

What should be in my .htaccess file to get this back to “factory fresh” settings?

Thanks all

Will