When I enter some unicode on to a page it seems to work fine, for a while. Subsequent views and edits show the unicode still happily displaying various characters. Then, after a day or so (it could be less, I'm not sure), the characters suddenly revert to ????? etc.

Example URL showing page with this problem:

http://www.adaptavist.com/display/USERGUIDE/Customising+the+View+and+Edit+Menus

There is an image for MSIE users so they can see what the menu mods should look like and then the unicode appears further down - or rather it would if it hadn't been mysteriously replaced by ?????

It seems that something is affecting the content post-edit and I can't work out where or what.

Here's the Unicode (I wonder if the same happens in JIRA?):

眺め

and

このページ