Yes I reinstalled MX and then the 11.02 upgrade that still exists on the Adobe site - and thanks for the tip re the new code, I think that must have been it. What I have lost is the main task bar so have had to customise the extra tools bar to include the pointer, line tool etc etc. Slightly irritating but functional. Any idea where the main tool bar may have gone and how to get it back?
Many thanks again for the tip re new codes.