Since nothing has been posted on this board so far:
http://boards2.sega.com/psu_board/viewtopic.php?t=94221
At least one user has had their rooms swapped with someone else. This includes store items and Partner Machinery item inventory. Apparently there have been some other reported cases of item loss too.
For the moment, it might be wise to play something else until the issue has been resolved.
EDIT: If you are experiencing this problem, post here:
http://boards2.sega.com/psu_board/viewtopic.php?t=94240
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