Are you using GDI mode or RedSDK, (options menu - native draw).
With v19 and this type of problem, I'd suggest GDI mode, then go into Options menu - Desktop, and turn off 'Open GL hardware acceleration', then in model space, right click the render teapot (or view menu - camera properties), select each of 'wireframe' 'hidden', 'draft' etc. and make sure none of them are set to open GL. (you may well have draft as open GL - switch it to Lightworks), my personal settings are wireframe = Native, Hidden = hidden line, both draft and quality = Lightworks
This should stop the problem from happening (hopefully).