Minecraft's Redstone Update is still brand new. In fact, it's less than a week old, and yet Mojang have already decided it needs a good polishing. To that end, version 1.5.1 of Minecraft is on its way and is set for release this Thursday. In the meantime, a pre-release of the update is available right now.
A usual, Mojang have made the pre-release available on their blog and have provided some succinct notes ("a bit simplified," they say) about the changes they've made. These are the improvements you can expect:
- Falling blocks will no longer glitch one extra step.
- White stitching between blocks should be less frequent.
- Paintings can now be placed again.
- Performance has been improved, which will purge many of those framerate issues.
- A whole bunch of bugs have been squished.
If you can't wait two days, then squirred away in the PCGamesN archives you will find a guide on how to test Minecraft snapshots that will help you understand how to get the pre-release running. Good luck. It's dark down there and tells me he hears moaning.