[BioC] Rgraphviz issues

[michael watson (IAH-C)]

OK, I am on windows XP, I have R 2.7.2, graphviz 2.20.2 and
Rgraphviz_1.18.1.

My graphs are just blank windows!

> library("Rgraphviz")
> set.seed(123)
> V <- letters[1:10]
> M <- 1:4
> g1 <- randomGraph(V, M, 0.2)
> 
> plot(g1)

Produces just a simple, beautiful white window....

Am I using the wrong version of graphviz?

Thanks
Mick