"RaulC, post: 309134, member: 140615"]They are updating themes for MIUI8, it's not after updating to 6.7.21, it's from MIUI7 to MIUI 8.
MIUI7 themes are not compatible with MIUI8.
Wait some more time.
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No, it started since 6.7.21. It was fine on 6.7.14...