Demo saves being corrupted

[Collingwood]

First of all great game , I've already spent more time on the demo than on many full games I've paid good money for.

I'm having a problem though:-

Three times now I've saved a battle only to get an error when I try to reload , the error box says :-

Director player error
Property not found
#fleet_mode_trigger
Script error continue?

If I click no Salvo! exits, if yes I just get a series of similar errors with #auto_move as the third line.
It isnt just a single file being corrupted as last time I saved under three different file names using special save.
This seems to happen towards the end of the battle (grrr!) so maybe its something to do with number of turns.

Anybody seen anything similar ?

p.s. was a pre plotted , simultaneous move system ever considered or would that be too cumbersome for fleet actions?