I have a Retina card in my A4000, and I find a lot of the Retina- specific software does not work right if I am using the Picasso-96 RTG interface. You might be running into something similar with your Cybergraphx RTG software.
I suppose the only way to test that theory is to boot into standard ECS mode with no Cybergraphx running and test it from there
I also find ImageFX 4.5 is a bit odd with RTG cards and you need to experiment a bit. I have a Picasso II, and my system uses Picasso-96... But in ImageFX on my A2000 I have to use a Cybergraphx viewer to get it to display? I try the Picasso and get nothing, I use the Cybergraphx and it come up great.
Maybe you are experiencing the same thing