By "Admin", do you mean, for example, an active Control Panel Window?
These don't seem to be a problem, though SSC sometimes can't seem to avoid getting some of the background in the isolated active window capture (Alt-PrtSc) - as in the screenshot above.
The only trouble I have had with SSC capturing things is when I want to capture a window plus an open drop-down menu whilst it is open. Sometimes
activating SSC seems to persist in closing the menu you want to capture whilst it is open, so then I have learned to use the OneNote Screen Clip function, because it seems to "freeze" the menus and everything on the screen whilst you carry out the clip operation. I think it might be operating on a buffered image (copy) of the whole screen as taken at the point in time when you activate the clip function.
Here's an example of a menu-open one that I had to do with the OneNote clip function: