I am seeing two issues under IE 7:
1) Clicking 'New' issue while trying to file an issue for YouTrack brought be to editing my last reported issue from several days ago. I tried this several time all with the same effect.
2) I can edit an issue that someone else entered. While I believe it would be nice to be able to annotate, tag, link an issue with 'related to' or duplicate of. Do you want any authenticated user to be able to edit someone elses issue ? It would seem that the SPAM bots would have a quickly track the YouTrack bug reports, just when I am starting to like it ;-) !