GRCT-webmaster’s solution above which requires the downloading and replacement of files within the phpFlickr folder WAS SPOT ON! Many thanks!! Prior to this I tried uninstalling / reinstalling, clearing cache, removing entries from the WP_options table, countless times… all to no avail.
I was just about to give up before I read and tried his / her solution.
I signed up to this forum only to let others know this solution worked!! ??
Good luck people!