When an itemframe is past 4 million blocks, you cannot place anything inside it, and if you try to place a block in it, it will place like a normal block and take up the whole voxel space. You cannot destroy the item frame with your fists or tools, but if you destroy the block it is on, it will pop off. When the x coord is past 4 million, you cannot place items on the west or east side, however the south and north side still work.
x > 4000000 , west/east affected
y> 4000000 , south north affected
x & y > 4000000 , all directions affected
You can get an item inside the itemframe but destroying the block it is on, and before it pops off, you place your block/item inside the frame and replace the block you broke. However it will not trigger a comparator, and you will not be able to turn it by right clicking.
This also happens in the nether. In multiplayer (vanilla) for me, even though only the x coord was past 4 million, the item frame was affected in all directions. I am not sure about the end or bukkit servers.
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migrated
marcono1234
Confirmed for 14w21b
Also the item frames seem to be darker on the west and north side
Torabi
Actually, you can't place an item frame on the east face of a block at x = 524287, which is... a prime number. The seventh Mersenne prime, in fact. Item frames on the east face of blocks past that can be placed, but do not function. Item frames on the west face of blocks past x = 524288 render black, and do not function.
The same behavior occurs on the north and south faces at those distances in the z direction.
migrated
Can confirm for 14w25b. Screenshot with an attempt to place item frames on all sides of two blocks: http://imgur.com/Hk6LX3v
Torabi
Just tested, this has been fixed. See MC-67626.
michael