[typhoon27]

Thank you for your suggestion. I did try that and returning to the previous button, which did not present the problem, but neither worked. I still suspect that something has gone amiss in a command line within the IL2 folder, but have yet to locate where it might be. To fine tune the problem a bit more, it only occurs when in the campaign selected. The back button in the "set difficulty" section works as does the one in the listing of all the campaigns. This makes me think it may be a command or instruction line that has been damaged.
Thank you again,
With respect,
Typhoon27