Hi :)
just to report back - managed to fix it... I did try the fix-rss-feed plugin - didn't fancy setting permissions for all files to have the white space removed so I decided to try the long and time-consuming approach of manually doing it.
Going through about 250-odd files, main WP files, within wp-admin, and mainly the includes folders - was surprised to find some <?php ?> tag unclosed - and lots of the files had the empty tail end lines...
SO I went through them all - and voila... error fixed - all ok.
I found the plugin useful for pinpointing all files with the space to be deleted - and it took a while but it's working.
PS: if you want my copy of the WP files, now with white-space removed - feel free to get in touch [prisca AT eyedea.eu] and I'll email it to you :)
