I know that this bug has been a long standing one, but as far as I know, the last time it occurred (1.7.5), it was 'fixed'. However, it seems to have happened again.
Basically, whenever I break a block, it reappears and then after about 5 seconds, disappears and drops the item entity.
The unusual thing is that this hasn't happened before really in 14w28b. So, it could be a factor of things. But after a few tests, it seems to be Superflats causing the problem
And a quick update.. I increased the amount of layers (by increasing the amount of dirt in the Superflat Preset), and the problem no longer occurs. So, I don't think it's down to FPS issues as the more blocks the world has to load, the more power it should take.. (I'm not sure on that bit, but I think that's how it works)
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Nope, I had it on Peaceful. I was pretty static. I was in a village taking down a house to get basic resources. I tried it on a barren superflat world under same conditions, and the same thing happened. I found that raising the ground level (I.e. adding more layers of dirt) cures the problem.. Which is counter-intuitive to what you said.. I think..
This tends to happen when the FPS rate is low, or on servers with a bit of lag.
Were you digging while the world was generating and the Slimes were taking over?