Problem with primitives

[Slanderous]

I had this issue on my old computer for some time, and to this day I don't know what was it caused by.

I've got a temporary fix for you, though. What you can do, just like I used to do is going to the folder with the texture you wish to select, copy its name, and paste it into "material" text field in the primitives tab.

Made a quick sloppy image for explaining purposes, in case you didn't get what I was rambling about

Spoiler below!