Here's an interesting one:
When I download a word attachment form gmail and then open it, certain full size windows have about a 1inch whitespace along the bottom and the only way to get rid of it is to sign out of windows (or restart obviously). BUT, if I don't make the window full screen I get my full window back and then I can stretch it accordingly.
I'll show you:
I just opened a word doc that was attached and this is the bottom of my firefox window:
Now, I took it off full screen and it's aback to normal:
At first, I thought it was a chrome issue but it also happens in firefox and then I thought it was isolated to browsers but I also have it with adobe:
This is adobe in full screen:
And this is adobe not full screen:
Finally, another piece to the puzzle is the whitespace only occurs on the monitor that I open the word doc. I have 2 monitors and if I place the doc on monitor 1 and open it the whitespace appears on monitor 1 and monitor 2 continues to function as normal with all fullsize windows being fine. if I place it on monitor 2 then the whitespace appears on monitor 2 and monitor 1 continues to function as normal with all full size windows being fine. Plus, my primary monitor is 1 but that doesn't appear to have any significance since then problem occurs on both.
Now, this might happen in more then just gmail but that's the only email that I receive attachments in and I'm too lazy to see if it happens with other email clients because again, I only use gmail and I've learned to now expect the whitespace and then I just take it off fullscreen and drag the window size.