Looks like it breaks at 389 (setProcessDPIAwarenessContext != nullptr && SUCCEEDED)
Edit:
To follow up, the Windows build I have been using for all of this has been 1607. I grabbed the latest windows 10 ISO and ran it on VirtualBox on the same machine, set scaling to 125% as before, and used the latest develop from github, this time avoiding any of the blurry scaling issues:
So it would appear that this isn’t the fault of Juce, but rather of something in the way the old Windows builds handle scaling.
If you’re still curious though, I ran the same breakpoints as before in the correctly-displaying build, and it broke at the same point.