I signed up for the 280Atlas Beta (one time fee of $20) and one of the first things I did was to create a native Cappuccino based app and take a windowed screenshot of it and guess what I found!
This isn’t really a bug, but just an observation on overflowing borders when taking windowed screenshots.
The border of the windowed screenshot is thicker than usual and overflowing, contrast this with a regular windowed screenshot:
Although the actual windowed screenshot looks fine:
In the meantime, check out how easy it is to create a native browser with Atlas here: