2016-02-13, 19:08
The only way to truly disable cache is opening the settings.xml file and removing the cache_folder value. The settings GUI doesn't let you select a "empty" or no path. I'll be adding a parameter in settings that lets you disable cache completely. As long as there is a path in this cache folder field, it will use it to cache thumbnails.That's why your log is fully of permission errors writing the thumbnail.
