Direct 3D 11 problems

I've encountered a couple Direct3D 11 problems. I made a video showing them -

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First is a screen size issue. I was playing around with Display Mode and Full Screen settings to see which one worked best, I saw my screen flicker a few times and now I can't get the screen to run at it's normal size when clicking into Run > Application. But, when I click into Build & Run, then it's normal. How can I change this back to how it was? Getting the 'Build & Run' size as the 'Run > Application' size?

And the second thing, can't really see it in the video itself because of compression. This problem only seems to happen in the Direct3D 11 Display Mode. I have a separate object on top of the player character that's a solid color with transparency around it. The object's semi-transparency will fade in and out as the character gets tired. This object has a very faded black box around it, though it's not always there. Is there a way I can get rid of it? Here's an image of what that looks like - Please login to see this link.

I found that my second problem has something to do with the replace color event, it still only happens with Direct3D 11, but erasing the replace color stopped that black box from appearing around the character. I have it set to flash red when the player is low on health. So I'll just use a separate object for that. Still haven't figured out a solution to my first issue though, which I guess probably isn't a huge deal since it doesn't effect 'Build & Run' at all, I'll still probably try reinstalling Fusion to see if that might fix it?