So I created a world in 1.7.5. I built a house (this was creative mode) and put up paintings and clocks in item frames. They I played this world in snapshot 14w11b. Then I changed it back to normal , and all the paintings and item frames fell off the wall and turned into items. And anything that was in the items frames disappeared
Environment
Windows 7 professional
Duplicate of MC-45009 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.