gerograph wrote:2) Screen dissapears
3) display is black
4) Screen reapears
This sounds like your monitor is having to resync. This usually happens when you switch to a screenmode with a different resolution, depth or scan rate. If the monitor cannot fully handle your new screenmode, then that would explain at least some of your problems.
I suggest checking what screenmode Final Writer is using, and trying to make it use the same one as Workbench.