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I found some thumbnails of jpegs and even folders containing them looking kind of destroyed. What is this? A sign that my hard disk is near of its end?
I also realized that changing the size of the thumbnails shows them just normal. But changing back to the size given in the picture and change the folder and come back let them appear as before: destroyed.
I am going to leave this as a comment. It appears this might not actually rebuild the cache file. I will investigate and provide an update if necessary. – Ramhound – 2015-01-14T17:29:22.530