Dagaith

I have a small problem with Bat4Max. I'm new to BATing and I've just made my first model for SimCity - it's a soviet era two-storey communal apartment. Anyway, when I exported the model a minor glitch appeared on one side (and on only one zoom level!) of the house. See for yourself: There's no black stripe when rendering in Max, only in exporting the model (and I've exported it several times). I'm using the latest Bat4Max and 3ds Max 2011. Anyone?