Window sizing, maximizing & fullscreen mode should be working all later no$xxx emus (if you were talking about the GAME window). The no$gba gaming version is intentionally having most GUI function removed, and requires a ROM-image being loaded to be of any use. So far it makes sense to prompt for a ROM-image. Only (big) problem is that it's blocking the Recent File selection until one has loaded a dummy ROM. Maybe I can include some screensaver-like dummy ROM in future versions, so the emulator can start running (and GUI can be accessed) with needing to select a ROM. Yes, same problem as in the Syphoon Filter screenshot (somewhere earlier in this thread). I think it's because I am using the same rendering function for Lines and Polygons. I'll need to do something about pixel accurate rendering someday.