Board Thread:Support Requests - Designing Your Wiki/@comment-4060385-20131123220816/@comment-1330470-20131124232138

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There's been some caching issues, but the solution is NOT to use Special:AchievementsCustomize. This will only result in the ugly border.

Your best bet is to upload the files via the link directly on the file's page, as you were before, and wait for the caching issues to resolve themselves. As of now your images will have an ugly border due to the most recent upload being through AchievementsCustomize.