Some parts of GUI transparent

[Crusoe]

I don't think the card is the problem. The issue seems to happen under OpenGL so I suspect rendering issue, but who knows.

[Morgra]

I don't think the card is the problem. The issue seems to happen under OpenGL so I suspect rendering issue, but who knows.

Yeah definitely. That's what I had meant, more or less

[Morgra]

Try to look through the folder and see what textures you seem to be missing when you have the GUI disappearing issue. Then maybe you can convert those trouble files into the correct color profile.

[Bloo.]

IEC is the color coding most commonly used in Europe, I'm unsure if that affects anything, but if switching the rendering mode seems to fix it, that may be all you can do. Definitely try what Morgra suggests, but I'm kinda stuck up to this point.

[barghosts]

Alright. The GUI that Joji sent seems to work, however reinstalling the ONYX GUI causes the issue again. Is the real problem the texture files of the GUI?

i suggest contacting the creator of the ONYX GUI about the issues with their mod, could be possible they missed a few things within the download

[Crusoe]

When comparing Bubblegum and ONYX folders (Not comparing the game folder), ONYX is missing:

black.jpg, cursorTex.jpg, cursorTex.png, gate.PNG, gate2.PNG, gate3.PNG, gateBlack.PNG, loadingBar.png, loadingBarMax.png, moon.PNG, skyMask.png, star.PNG, sun.PNG, sunRadiance.PNG, waterTex1.png, waterTex2.png, waves2.dds, white.jpg

The thing is, these files are not for the GUI itself. They are for things like the sun, moon, and gates.
When comparing Bubblegum to the actual game GUI, the game is missing:

cursorTex.png, loadingBar.png, loadingBarMax.png

however, these files don't seem to really do anything.

Alright. The GUI that Joji sent seems to work, however reinstalling the ONYX GUI causes the issue again. Is the real problem the texture files of the GUI?

i suggest contacting the creator of the ONYX GUI about the issues with their mod, could be possible they missed a few things within the download

The problem is, that this issue is also about the original GUI as well, not only ONYX. I am looking for another fix as I do not want to switch renderers at the moment.