Rfactor Crashing on BTB Circuit Load

[Drummer]

Hi everyone!

I'm making a circuit for Rfactor in BTB; everything's going well except for a recent problem I've been having, which is a freeze on loading the circuit in Rfactor. It happens in all race, testing and practise modes with all cars, whether I'm alone or loading AI. My most recent change to my circuit, I think, has to be a new track surface material... Well, two to be exact. What's gone wrong, does anyone know? It loads to about one or two percent, then just sits there; if I press any keys after that, Rfactor just disappears.

While I'm on this, what's the best way to get a specific texture into BTB, without messing about with objects and so on? I don't need a new object or anything, just a range of different driving surface materials, to give some variety.

Thankyou for reading.