I did add one new plug-in/ruby (tt_uv_toolkit.rb) but that has long since been deleted - I'm just trying to get it working with a clean installation and new window!
All signs of the "old" stuff have been moved to another drive, the main hard drive has had all traces (that I can find) of SU and associated files removed.
I render files with Podium (which continues to work as expected)
Thanks for your reply.