Seeing blocks through clouds was fixed a few snapshots ago. This has again been broken as of Snapshot 13w10b. 13w10a was fine.
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duplicates 1
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In MC-997:
Jeb (Jens Bergensten) added a comment - 06/Mar/13 11:43 AM
Reverted this fix because of performance issues. In the future we can fix this again, but with more specific cloud options in the video settings menu.
Duplicate of MC-997, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.