Randomly, particles that move from bookshelves to enchanting tables quickly flash black and then vanish, as opposed to their usual behaviour of a nice slow white movement from the bookshelf to the table.
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Confirmed on two separate machines here. I get them as flashing black icons however, not the normally animated ones.
not only with bookshelfs, when you remove a block and place it again, the breaking particles are inside a block and thus will be black.

Is this still a concern in the current Minecraft version 1.6.4 / Launcher version 1.2.5 ? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
confirmed
[Mod] CubeTheThird I cant confirm this because I cant buy minecraft and i cant play offline with an account without the game buyed.

Is this still a concern in the latest Minecraft version 14w03b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed for 14w03b

This still occurs in snapshot 14w29b.
Confirmed for 14w31a, although this bug is partially fixed. Particles only turn black when inside a block, therefore the particle returns to its default texture once outside of a block.
confirmed for 14w32d
Whats happening with the first screenshot? Red top of a grass block?
Still occurs in 1.8 pre-3. I noticed it while mining block on the ground you could see the particles going black when entering the block above.
Jasper van den Berg, this screen is from [Mod] Anon Ymus, ask to him.