UMG breaks when playing in new window (PIE)

I just updated my project from 4.22 to 4.23, and the first thing I noticed was that my UMG menu now looked broken. Buttons and text were missing, but some elements, like the background border and blur and the image I use for the hover glow effect on buttons still showed. I tried recompiling my widget BPs again, but to no help.

Eventually I tried running in standalone, and there the menu looked fine again. I then played directly in the editor window, and to my surprise it looked fine there as well. But whenever I try to run using “New Editor Window (PIE)” it goes back to being broken.

Here’s how it looks when launching in in “Selected Viewport”

And here’s how it looks when launching in in “New Editor Window (PIE)”

I have no idea how this can happen, so any advice would be appreciated.

I would much rather be able to play using a new window, as that way I can specify the resolution and aspect ratio properly, and while standalone would be the most accurate representation, it takes too long to start up for a fast iterative workflow.

Hello,

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Thanks