Thank you both for your input.
Going with Psychoadept first - Searching and right clicking a track shows it is the Library that is greyed out and not the Inbox.
Have looked for Filters, but as far as I can see none exist - I certainly have not generated any - not got that clever with the system yet :-) .
Ref Sveakul's idea - tried that with one track but it did not appear in the Library.
Where next??
On my initial set up of MB I had a folder of track files, track by track in one folder. But using MB to rip it has created (which I prefer) an Artist Folder then a Album sub folder in which the tracks are listed. Does this distinction make any difference?
Any thought greatly appreciated, as I am try to gear myself up to digitise a CD and vinyl collection and want to know what I am doing before going too far.