Endermen can pick up logs under loose cobble slabs

[Battosay]

Those bastards keep stealing the logs under my loose cobble slab roof ! I'm not sure if they can do it with other type of slabs.

[FlowerChild]

Will take a look. I may need to make some accommodation for endermen stealing slabs themselves (not cobble, but dirt and such), as I don't think those were around when I created that feature.

[FlowerChild]

This is actually not a bug. Enderman can steal logs from beneath just about anything. The slabs aren't an exception. What is important is the number of neighboring blocks. I'd wager that the logs in question were in an odd position, like say bordering on a gap in a wall (like a window or what have you), that allowed the enderman to grab them, but the slabs on top should have counted just like any other solid block for that evaluation.