Hi Christopher,
Glad the printing issue is solved with the 2D image. Have you tried the Render 3D Real View yet? The results from that will really 'blow you away' to use your earlier expression. I assume you will have see some of the examples in the Gallery section of the Forum.
Dual monitors should not be any problem - I use it that way nearly all the time and I know Doug and others do too. Does it happen even on a new 'blank' model (4 walls and a roof)? Try that, just to eliminate the possibility of a corruption in the actual model itself. Run File/Repair Project - it may remove a corrupt wall or something.
I would suggest that you also make sure you have the latest video drivers on your PC. If these do not help, try turning off Hardware Acceleration. This is an issue on some PCs occasionally. It will make moving around (walkthroughs etc) jerky but may solve the problem. (Settings/Program Settings/Graphics).
I usually suggest to new users to read through all the Program Settings panels (if you have not already done so)so you know what defaults can be changed to suit your way of working. From your CAD experience you will be familiar with many of them. One useful one often missed, is Settings/ Program Settings/ Drawing Aids - Nudge. With that setting you can nudge things around, in 1mm increments if you want, using the keyboard arrow keys. Ideal for moving things INTO each other to make other things out of them as you can posision them precisely that way. Also it is useful to study Settings/ Building Locations, as this is a crucial area to understand too as it contols all the vertical aspects of the 3D model.
Have fun and ask if you get stuck.
Allan