Yeah, I feel like I am in the same spot as you are. I run Linux across all my machines, but that means that I can't have Opera GX. I feel that the problem is that devs are trying to get Opera GX built for the more popular OS's (i.e. MacOS, Windows).

@nadavatar64 I'm a noob at Linux, but from some quick googling, it turns out that MATE is a continuation of Gnome 2, so maybe it's just Gnome. I'll try running a vm using a different de.

Edit : Actually, it seems to be a issue with snap. I installed Discord with snap and when uploading files, it also shows squares.

I'm having the same problem. Here's a image of me trying to select a file to upload to this post.

You are also running the MATE desktop environment, right?

Yeah, I feel like I am in the same spot as you are. I run Linux across all my machines, but that means that I can't have Opera GX. I feel that the problem is that devs are trying to get Opera GX built for the more popular OS's (i.e. MacOS, Windows).