"Hi Surgene- please try, as a test, un-checking 'Use hardware accelerated modes' and see if that makes any difference... ? Also, it is probably worth updating video drivers, just in case. -Pascal pascal@mcneel.com"

"no the screens stay black even when scrolling or using commands.  The use accelerated hardware modes as well as the redraw scene when viewports are exposed are checked.  the three appearance settings are set to none. "

"Hi Surgene- do the screens draw correctly if you move the view around or start a command? What boxes are checked in Options > View > OpenGL page? thanks,  -Pascal pascal@mcneel.com "

"Hi Surgene, What do you mean by 'custom build'? Is this an old v5 beta for instance? I would suggest making sure you have the latest drivers for your video card installed. I'm also wondering if you are running Windows on a Mac and…"

"Well, I guess the person who built you the custom build needs to respond then...  ----H"

"Here's a link to a Wiki page with the details of sorting this out: Diagnosing Rhino 5 Startup Errors: http://wiki.mcneel.com/rhino/crashhelp John BrockTech SupportRhinocerosSeattleUSA"

"I am using a custom build, which may be part of the problem.  I am using a SAPPHIRE Radeon HD 6870 video card.  I do not have any plug ins running."

"This sounds suspiciously like a video card/driver problem...  What are your computer specs (especially video card)?  Does the problem still occur if you start Rhino in safe mode?  Do you have any plug-ins running? ----H"