VNC viewer shows only black screen, but sends events to droidVNC

I am using a VNC server on my Android device (droidVNC it is called.) I have tried using multiple VNC viewers and each one has the same results: - the viewer window is a black screen (sometimes a blue screen.) - clicking on the viewer correctly sends the events to the phone (I can see the screen change, etc.) but it is just blind clicking and pretty unusable. I think that since this is the same problem on multiple different viewers (TightVNC Viewr, RealVNC Viewer) that it is a problem with droidVNC server. Do you think the problem is actually with the VNC Viewer? Has anybody experienced something like this before, and are there any tips you can give to make the droidVNC server run faster/better?