If reloading the world, then all the item frames with maps inside (And possibly all the item frames) turn south and the items disappear.
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That level was created with snapshot 14w11b and I recently upgraded to 14w17a. The maps were facing one east and one west, and had zoom level 0 maps in it. It also may be worth mentioning that the maps in the itemframes were in the area where the maps were created, so you could see the green arrows on it.
galaxy_2alex
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. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
This can be resolved as a dupe of MC-1058.
Playtested and I could not replicate the bug. Perhaps the total number of item frames is relevent, or what zoom level the map is at. When I tested it I had 8 item frames (2 per direction, one with a zoom level 0 map in it, one with a random item in it). Also is this a level created in 14w17a or are you upgrading it from a previous version?