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I can easily open the HDImages in my image viewer, so I'm not sure why my video card would have a problem loading them in the game.

It's the way OpenGL, or hardware acceleration in general works. Whoever made the engine for NightSkyHD didn't account for the fact that some video cards cannot load images larger than 2048x2048 as textures. In some cases it's also just the graphics driver's fault.

Thanks, flansuse and simon for valuable information!

I've bought NightSky in Humble Bundle with Android 5 and met the same problem (white rectangles in some places) on Debian Sid and old notebook with ATI Radeon Xpress X1250.

So far, moving out (renaming) some HD textures returned images into Skyming level for me.

Here is a command I've used to find images to rename (those with width or height more than 2048 pixels):identify -format '%f - %[fx:(w>2048)|(h>2048)]\n' NightSky/HDImages/* | awk '/- 1$/ {print $1}'
(identify command is installed with imagemagick package).

List of found files:BigStraw3.png
BigStraw4.png
Fern4.png
LoopCreature.png
Shifter0.png
Shifter1.png
Shifter2.png
Shifter3.png
TriAnimAnimal1.png
TriAnimAnimal2.png