Blocks: Are rendered completely incorrect
Items: Are floating and have a gap between them and the frame.
Items on "Fast" graphics: Not rendering at all
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This is not just older items, I tried placing new blocks in items frames and got the attached result.
On a mac here, (10.7.5). cannot see items in frames, + cannot place things into item frames (may just be because i cannot see them).
And item frames don't render in 3d. I mean their outter line is not 3d.
Same problem here.
It happens with all blocks, items do display correctly though
Just seen this myself. I tried an item frame on 5 different types of blocks to see if it was consistent.
The item apparently is entered into the frame, just not rendered. I tried the new comparator feature and does transfer the signal.

Happens to me also, on Mac OS X 10.9.1, java 7. Only the visible insides of the block render, and items float in front. Open GL is up to date also.

Also, on fast graphic, items do not render at all.
Same happens to me as well. Block items show on the sides when in the item frame, "flat" items (when placed into an item frame) disappear completely, but they're still there since the new comparator feature confirms it.
Since it's already been changed to include my reported bug, feel free to take my screenshots too.
This bug is a pain! Confirmed in 14w04b. The maps are invisible in item frames.
This is what Item frames look like that have maps in them in 14w04b. It renders them without the actual map being visible.
do i have to wait for the next snapshot for the fix
Confimed
http://i.imgur.com/524RyMM.png