solved. I had to start it with administrator privileges.
Dope, keep up the good work!
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It's too small text files, which saves only when you saving any shader or applying shader to image (last used shader). It's can't make any bad impact to your SSD. Usually SSD vendors make warranty for a 3-5 years for writing 20 GB/day. I can't imagine situation, when you will write 20 MB of shaders / day.