The problem is not what I thought originally - the reason I get the end of turn message is because all units outside cities have disappeared. I carried on playing as the USA and the same thing applies - all units outside cities have disappeared. 
Have you changed the scenario files your end? If not, could you humour me by re-raring you save and reposting, so I can have another go.

Have you changed the scenario files your end? If not, could you humour me by re-raring you save and reposting, so I can have another go.
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