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Download unity 2018.2, it's fixed in that version, or should be since it was in the beta
This is fixed in the Beta version so they do know about it https://unity3d.com/unity/beta-download#release-notes "2D: Fix tiles not rendered in...
https://unity3d.com/unity/beta-download#release-notes "2D: Fix tiles not rendered in tile palette window (1010103)" among other palette bugs, at...
Also having the same issue, thought it was a scripted tile messing it up, re-install & it still happens using latest version