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Well, now it keeps running after start with a window full of what I assume is garbage from the graphics memory. Here's an excerpt of the output before I killed it myself: https://pastebin.com/raw/QXDxsZh4

That's new information though,

GL_INVALID_OPERATION in glUseProgram(program 5 not linked)

Apparently, it didn't get linked somehow... I've added a debug print to check if the program gets linked correctly. Again, tell me to stop giving you things to do if I'm pushing.

https://pastebin.com/raw/p4RzHL1T

Wow, your graphics card is giving me nothing...

I changed a lot in the shaders, could you check if the repo version fixes your problem?