Build the attached setup, place a redstone block between the pistons and wait a few seconds. Alternatively kill yourself (/kill), fly away and come back etc. (same steps as to reproduce MC-177)
Actual outcome: Redstone block turns invisible.
Expected outcome: Redstone block stays visible.
Bug also exists for other blocks if you power them
Probably the same underlying issue as MC-177, but this particular issue can not be reproduced anymore because of changed piston behavior.
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you don't have to use /kill or fly away. you just have to wait or try again

confirmed, seen it in cubehamsters video http://youtu.be/gAAoKMU6dBw

Also notice that this bug doesn't need a redstone block, on the attached screenshot the diamond block becomes invisible, too, after a few seconds.

Here's a video of the behavior I made. Also note that the redstone does not appear to pulse.

Redstone not appearing to pulse is MC-5778

This seems to be much worse with 13w05b as the block now seems to disappear split seconds after starting the clock.

Confirmed.

I can no longer reproduce in 13w07a.

Still reproducible using the 4-piston clock with non-sticky pistons

Confirmed to still occur on 13w07a with the four piston setup if no repeater delays are added. Reopened.
EDIT:
Actually, also occurs with 2-piston setup without repeaters after waiting a few seconds.

Bug seems to be sort of resolved with sticky pistons but still happens on normal ones.
If you build the 4-piston setup with sticky pistons it looks like the block is pushed through all 4 positions in one single tick, which is very weird. But at least it doesn't turn permanently invisible.
Behavior for non-sticky piston seems to be unchanged.

Got it now. For me, there is both the redstone block and an invisible one that occupy the same space and experience z-fighting with each other. Upon destroying the redstone block, the invisible one continues around.

I filed MC-10677 for the new weird sticky piston behavior.

Unable to reproduce with 4 piston setup.

Confirmed fixed for both the 2 and 4 piston setup in MC 1.5. The pistons are now behaving properly and are moving slower

Thanks for the update. 😉