Space between block color glitch

Why am I getting those weird glitches and how can I stop it? I've never had them before 1.5.

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Solution 1:

From the 1.5.1 patch release notes:

  • Notable: White stitching between blocks should be less frequent

So presumably, the answer is to wait a few days for that to be released (or snag the prerelease, up now, if you feel brave)