Sorta freeze on non-player processing

[Midwinter]

You could always just go to Preferences in your EB folder.

That only works if you start a new campaign, apparently. And that's exactly what I'm trying to avoid.

I've watched what happened with the fog of war toggled off. Everything runs fine until it gets to the Lusotans, and then nothing happens. No map freeze, but no movement of any Lusotan units either.

Please can some wise soul make a suggestion about how to fix the problem? It'll drive me nuts to drop my lovely Greek Cities campaign this far in, and I'd hate the feeling of waiting for the sky to fall again if I have to start a fresh EB campaign without knowing if this weird freeze might hit again.