I've got the latest Impulse 1.06 on Windows XP. The campaign plays fine but when I quit Elemental, restart and try to load any save the game crashes.
Needless to say this means that the campaign is unplayable.
I am also using XP and 1.06 and can load campaign saves without problems. Maybe you should try reinstalling.
Reinstalling worked. Looks like the auto-install over the betas didn't clean everything up correctly.
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