I've got some folders I added to that lefthand bar in the Finder that lists mounted volumes, the photos/music/videos/documents folders, applications folder, etc. The folders I add have custom icons (including the Utilities folder, which has a custom icon by default). Sometimes, the icons show up, but sometimes they randomly blank out to look like generic folders - which makes 'em a little hard to quickly identify.
This is what I'm talking about
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Any idea on how I can make this stop happening? Rebooting and/or restarting the Finder doesn't always fix it.