annoying screen glitch

[DuDumWun 勃起不全]

since i've downloaded the game i've experienced a glitch where the top let area of my screen is just a black rectangle and the top left is stuck still image in the same rectangular shape. It's been like this since i've downloaded. The only thing that I've seen work is creating a PERFECT screen resolution that fixes the problem, but it's very precise and takes me minutes to get exact. I've tried reinstalling the game, restarting steam, and restarting my computer. If there's a way to fix this please help! thanks. If there is already a fix/post about this please show me a link to that as well.

Here is a screenshot: http://steamcommunity.com/id/DuhDumWun/screenshot/854983264186043090

[Arcanus]

Well, that's new to me. From what I've seen, going Full Screen is a bad idea on RoTMG. I cannot provide great help, but a good idea is to look at your settings for flash player.