I have the same issue with my A500+
but i hva not had time to go in deapt with the issue.
someone suggested that kick 3.0+ is required, but looking at the wiki link kick 2.X should be sufficient.
Have you tried running the config tools?
You need to to put indivision's own screenmodes into screenmode folder.
I do not remember if "vgaonly" should/not be present.
try reading the
wikiarticle about it.