Black bars problem and windowed mode broken

[hellointernetclass]

Hello i am a game dev i am using Ulydev's Push Master its was really useful for my game development
but it has a issue,
Well there is the problem you see my game runs in 640x360 so i used the push master. My computer runs at a resolution of 1366x768
So when its in windowed mode pixel distorsion. i have already fixed that by replace the 0.5 window size by a 0.469 it got fixed
but when i was testing in 1280x720 with the modified 0.469 window size , its just give a black image , in 0.5 window size in 1280x720 the image was displaying , too in 1366x768 when i was setting in fullscreen my game blacks bars appears , but in 1280x720 No black bars.
Sorry if it is long.
Can you fix this Ulydev?