Screenshots keep failing (PC)

Would anyone know why I keep getting a "Screenshot Failed" error?
I am on PC, windows 7, and taking screenshots seems to only work intermittently for me. Sometimes it works, sometimes it does not.

I am not sure how to solve it or why it is happening, I have a lot of free HD space (130+ gb free) I am not in a cutscene or any party or queue or anything just standing around the goblet it is not working.

This has been happening a lot for me, and I only see old posts from 2013 related to the PS3.

antivirus software interfering with the writing of the file perhaps?

I have a sort like problem with screenshots, i dont get any error and it seemingly works fine... but when i check the actual screenshot all i see is black, there is no picture there's only black and it happens everytime i make a screenshot

Are you using SweetFX or SMAA?