It's hard to explain this problem so i'll provide plenty of pictures, just so you can see what's going on. Basically, the problem i'm facing is that i can see background applications when another application goes to full screen, or full-borderless-window mode (such as a game, movie) and other cases as well, such as video playback in a web browser (eg. on youtube either in full screen mode, or not).
To clarify more, the windows on the background needn't actually be on the background, they don't even need to be open at the time of playback. For example i regularly have my chrome web browser open, as well as the application Code::Blocks, as well as other windows explorer tabs, or Microsoft word etc.
I have been carefully gathering many "printscreens" and photos with my phone over the course of at least a month now just to seek help for this issue, because at first while googling i couldn't find anything. So i noticed that when taking these "printscreens" the background applications couldn't be seen in the image afterwards (by this i figured out how "printscreen" works - if you get my meaning). So i had to take all pictures with my camera, just to show you what i really see when i look at the computer screen.
In the pictures i will provide below these applications are always seen on the background (sometimes it's more subtle, other it's more obvious depending on the colors of the video/game on the foreground as well, which will make it more, or less obvious).
It's much more obvious in this one. This isn't even a movie, or video, or anything full screen. It's just chrome loading a pdf and on the background we can see other windows and words from my background apps.
And now that i have your attention i have to tell you that it gets much more weird than that. I have dual boot my windows 8.1 pc with ubuntu linux. These "background images" don't just appear on my windows 8.1 pc but on GRUB as well! Grub is a multiboot OS loader, which loads after uefi bios and gives me a screen where i have to select to enter either windows or ubuntu. You can see on the image below.
I hope you can see it (upper right more noticeable). The image that appears on GRUB is the last background applications i had open when i was in windows. Can you believe this?
The problem actually persists even after shutdowns, restarts etc ( i can see the last open windows i had the last time my windows operating systems was running). I haven't noticed this on my linux environment. I don't use ubuntu that much, but from the little i saw, i don't think linux is affected.
Anyway. It's strange enough as it is. I hope you understood the issue. If you didn't i can explain more. This becomes all the more annoying to me and i really don't know what it is, why it appears and how i can fix it. It's very bizarre. Anything you can do to help i would be grateful. Thanks in advance.