Windows 8.1 includes support for high-PPI displays. The Retina Macbooks are one example. Here are some others that are Windows-based:
http://forum.notebookreview.com/har...-high-res-high-ppi-laptops-1080p-screens.html
So the issue applies to any computer on this list and ones with > ~200 PPI.
There is a workaround so B4A runs in high-res mode, but it has a trade-off. I've attached a screenshot to illustrate (Windows 8.1).
The left is B4A running in traditional mode. The right shows B4A using the workaround. If you maximize the image, the left is blurry and the right one crisp. That's high-res mode. (fyi - you get this by creating a shortcut to the .exe and selecting "Disable display scaling on high-DPI settings".)
The trade-off is that the toolbar icons are now shown in native resolution. So they're tiny. Sorry I'm not sure if this is the right analogy, but what I can think of is dp vs. px.
Are these details helpful?