I have recently switched from PC to Mac and since I am not very familiar with the environment I would like to ask for a help. My MacBook Air with El Capitan installed has problem with icons association. This problem applies for html, txt, microsoft office and pdf files. All of these files are displayed as universal white files (see image_01). What is curious though is that during first 2-3 seconds after boot up icons are shown correctly, or sort of, except for txt files (see image_02), sorry for the quality.
All solutions I found are outdated and none of them worked. Any tips for a beginner?