While approaching slabs, your character jumps rather than just walking up the slabs like stairs.
In this situation, it's only just a small fraction of the time you would jump rather walk up the slabs like stairs. I feel like this might be a bug, but I wanted to address this to you, the developer, and see if I'm reporting correctly.
This "bug" gets rather annoying when using slabs as stairs for decoration in front of doors. I attached a pic to give just an example of the situation.
Also too, this happens on creative just as well on survival.
Thanks Mojang
EDIT: This is still affecting versions all the way up to 0.9.4. It only happens a few percentage of the time. Seems like it happens when a full block is behind a slab
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This comment explains the side-view screenshot of two similar builds causing this glitch and one solution build.
The build on the back left demonstrates why this bug happens, the picture on he back right shows what the game registers when you build your setup, the build in front shows how to fix the problem momentarily.
Noting that the bottom build works and allows the player to easily step up slabs, the game has the code, but it may just be the order it was entered into the source (it checks to see if you can jump before it checks to see if you can step up the slabs)
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Ok, it appears I made a mistake. It is only partially reproducible, not 100%. However it is reproducible.
If I had the power i would confirm, I am using an iPod Touch 3rd Gen and get the same problem. It happenns because programming was added to make the player jump if there is a block, a space, then another block one level higher. In the current version this can be solved by making slab staircases use two slabs on each level.