Finder files are all black squares and cant see the text properly

[Coengi]

hi,

on my wallpaper everything looks fine, but when i have the fidner opened, there are many things that don't work like they should. in the finder all i've got is black squares and no readable filenames, so that should be fixed i think.

im in Mac High Sierra Beta bytheway and it works like a sharm!!!

regards, Coen