There seem to be a weird behavior of the scaling while using "letterbox integer scale" when you export to Universal Windows 8.1 App, and run it on a phone. I tested both on an actual device and phone emulators.
Note : It scales perfectly using the desktop version of Windows 8.1
Attach a Capx
https://dl.dropboxusercontent.com/u/700 ... aling.capx
Description of Capx
The attached capx as a window size of 640x360. Which is supposed to "integer scale" up to 1280x720 on both 720p and WXGA devices, and to 1920x1080 on 1080p devices. However, as you launch the app on said device, you'll notice the window size isn't scaling correctly at all. There's is a "debug" text object that get its text set to the current window size. What is weird is the fact that the canvas is definitely scaling, but absolutely not by an integer ratio (hence the bug).
Steps to Reproduce Bug
Export to Universal Windows 8.1+
Run on a 720p, WXGA or 1080p device/emulator
The window size is not a multiple of 640x360.
A window size of 640x360, 1280x720, 1920x1080, etc., depending on the device used.
Browsers unaffected, everything works as intended.
Problem in a wrapped WP8.1 app.
Works fine when launched as a Window 8.1 App
Operating System and Service Pack
Windows 8.1 FR
Construct 2 Version ID