I've created a custom folder icon with Icon Composer.
When I apply the icon to a folder, it changes in the Finder, but when I QuickLook the folder, it shows a blank QL page.. (i.e. no icon)
Best guess - quicklook does not fully support .icns files. Obviously most icons show up with quicklook so that is strange though. How are you "applying" it?
Best guess - quicklook does not fully support .icns files. Obviously most icons show up with quicklook so that is strange though. How are you "applying" it?