I don't really know how to describe this correctly but basically after opening an image to be converted to a material using AI I can see it loading but once it's done I'm just left with a black mesh and no textures whatsoever 😕😕
Can you tell if there were no changes after deleting/reinstalling file?
Can you explain step by step how you save your file and how you try to open them? This will help us reproduce the issue. It would be great if you could share a project you have this issue with.
Workaround: Open the cache folder, delete all black files, reopen the project. The error often (but not only) occurs when Sampler is trying to calculate multiple materials at once. After deletion of the cached files, assuming that it weren't all of them, Sampler has to recreate them and since there are less files to compute, the chance for this error to occur is smaller - but not zero. In case it happens again, repeat.