We recently changed the system to support international characters correctly (or as correctly as we can), and in the process, we had one day of glitches, and some data was lost. You won't notice the loss until you post a comment to a story - if the story contains some unknown characters, the story will be truncated.
Fortunately, we have backups. Over the next few days, we'll be doing a more refined conversion of old data to the new format. At worst, we'll lose bits of text entered in the past two days.
PS - is there anyone out there who is a Drupal 7 whiz who has some time and wants to volunteer to work on IMC? We'd like to convert to that system.