Thanks for the quick response, it's much appreciated.
I tried clicking on the 'express' icon and again everything froze, so I then hit the 'esc' key and voila, it now works. The strange thing is that now whenever I restart the program everything works as normal with the expressions menu opening as soon as I click on the icon - no freezing at all - work that one out !
I only have one monitor so that shouldn't have been the problem.
Just glad that it's all now working fine.
Many thanks for your help