I'm having this issue, too, and while your explanation makes sense, I don't think it's applicable. I am using version 2.0.1 Beta (2.0.1.1597) on Windows with 175% desktop scaling, and I get this error for every preset, including the built-in ones, no matter what size they are. I had used the 1.x version for a long time without any issues.
I have one profile that works on my machine, and it is setting the window to 1280 x 1024. If I change the width by one pixel in either direction, it will tell me that the width is too small. The same happens for the height. Only 1280 x 1024 works. Well, 1024 x 1024 worked, too, but I have no explanation for that one. Maybe 1280 x 1280 would work? In any case, it seems like you have a bug.
I'm having this issue, too, and while your explanation makes sense, I don't think it's applicable. I am using version 2.0.1 Beta (2.0.1.1597) on Windows with 175% desktop scaling, and I get this error for every preset, including the built-in ones, no matter what size they are. I had used the 1.x version for a long time without any issues.
I have one profile that works on my machine, and it is setting the window to 1280 x 1024. If I change the width by one pixel in either direction, it will tell me that the width is too small. The same happens for the height. Only 1280 x 1024 works. Well, 1024 x 1024 worked, too, but I have no explanation for that one. Maybe 1280 x 1280 would work? In any case, it seems like you have a bug.