In 1.7.4 I've seen several rendering issues with slabs.I've only noticed it with Cobblestone and Stone slabs, both with regular and upside down variants.
As seen in the attached images:
sometimes slab faces are rendered in the wrong position inside the block space (e.g. regular bottom-side slabs render their top face at the top of the block space they occupy
sometimes the whole slab will flicker up to the upside-down position
both of these rendering issues randomly affect placed blocks, dropped items, and items in inventories.
sometimes the black hitbox outline flickers incorrectly as well, even going as far as to highlight a block I'm not even aiming at.
This is a visual glitch only. The flickering happens very quickly and not consistently. Although sometimes the improper render will stick around until a block update, which is how I got the one screenshot where the top face is rendered on the top of the block space.
I haven't been able to reproduce it reliably, and I really can't tell whether this is a Minecraft thing, or a video driver thing or what.
P.S. forgot to mention this is in SSP.
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Please download & install the latest driver for your graphics card : http://www.nvidia.com/download/driverResults.aspx/71704/en-us
The latest driver for my card is currently 332.21. I was already running that version, however I've redownloaded and reinstalled it, choosing the clean installation option. The problem still persists.
IIRC, 332.21 is a recent release, and I'm pretty sure I was having this problem on the last driver version as well, which was 331.something.
I loaded up a superflat world made of 1 layer of cobble slabs, and randomly placed slabs everywhere and filled my inventory with them and cannot reproduce the problem. I get the feeling that this may have something to do with the much higher load my single player world is under, what with all the mobs and tile entities.
This issue was in fact already reported a long time ago: MC-15366
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.