In converting one of my 1st simple BTB rFactor tracks to GTR2 using racerm's tutorial - successful in every respect EXCEPT there is no horizon visible in the GTR2 version. Only sky. Big black hole beneath. Lower edge of sky visible from track. Any ideas what I may have done wrong please? One more thing - ai works well in GTR2 during actual race but in practise they all go at half speed - !????