The online Wall Street Journal's Real Time Report has this story:
Sola Aoi (蒼井そら, Aoi Sora; also known as Sora Aoi, a stage name; her real name is unknown) is a Japanese Adult Video idol, nude model, and media personality. On her blog, Sola Aoi made a call for friendship between China and Japan. This is the way it looked originally:
This caused a furor among Chinese bloggers, who thought — judging from the position of the two characters — that she was giving priority to Japan. So she quickly changed her appeal to this:
But the bloggers were mistaken, since vertically oriented texts are read from right to left, as all Japanese know. Mainland Chinese, whose writing goes horizontally from left to right, are accustomed to thinking of the left side as having preference.
This issue was discussed earlier on Language Log in "Burlesque Matinée at the Max Planck Gesellschaft". See also "The MaxPlanckForschung Cover Fiasco: How It Happened".
[A tip of the hat to Shaun Kindred and Randy Alexander]