Ok I'm at a lost what caused the screenshot issue, a reboot and its still working. It appears I must be wrong that Fences is the cause but not a clue what is - it's stange - it started after the install. At least I thought it did. Never mind. Thread ended :-)
Ok I killed Fences and screenshots is working, though - Fences is still running so I'm not convinced to be fair that it is necessarily the cause. Is there a reason there is two fence.exe processes in the startup - I presume there should only be one? I don't know if running two was part of the issue. Atm I'm not sure (still) the cause of the issue. I couldn't screenshot earlier, I can now. I'll see if its the same after rebooting again - not had a chance to do that.
The problem has occured since Fences was installed - I guess I can confirm this by disabling Fences, But Fences is the only thing affecting my desktop unless Microsoft have done something 'helpful' again. I'll get back to you, The fact it overscrolls beyond my desktop resolution I assumed might have been part of the issue but I will check.
I don't know if anyone else gets this - and I've been unable to find the cause. If I screenshot, or use the snipping tool or snip and sketch, anything that does a screenshot partial or full. It simply shows a blank grey screen. I don't know if this is an app setting, a conflict or something I can alter. I have an Nvida 1080ti,(With GSynch running) Windows 10 Pro, VMWare Workstation running And numerous other apps/programs but none related to the desktop/screen