Barry,
You're a star

Changing the use_glshaders to false appears to have fixed my problem.
I'll dig a bit deeper, try a few more thigns and try to replicate my problem. but it's looking very good.
I'm currently running 0.10.3 .... I was worried 0.10.4 is a bit new?
Your throughts .... should I be running the newer version?
Thanks,
Paul