Scaling could definitely be the issue with that. I had that problem when first using gamemaker with windows of arbitrary size (certain rows/columns of pixels can get rounded out). I guess Ryam could double check that the scaling used is a round number and maybe set a fixed standard window size like 640x480 to see if that fixes the border.
Thank you for your help!
I've actually read about the scaling and rounding issue on various other forums, but couldn't really wrap my head around it. This is how I set up the room:
And this is the view:
For the x and y placement of the textbox, I've used the round() function, because I thought that would solve the problem, but it doesn't so far. However, even though this bugs me a lot, I consider this to be a minor cosmetic flaw at the moment and will try to focus on other more important things.
Yeah definitely a minor issue particularly for a game jam. I suddenly have a feeling that this happened to me when the width and height of my sprites were not multiples of 8, so maybe see if the window you're building is a multiple of 8 pixels?
-Edit- Maybe it was for sprites with odd height/width instead of even. Multiples of 8 may not be the exact problem, but I don't really remember at the moment.