You found a bug? That is great. Please submit it in the bugtracker, so I can fix it asap!
It would help me a lot if you could answer the following questions in your report.
1. Where has is happened? (Link to the page)
2. When did it happen?
3. Under which circumstances did it happen?
4. Do you know how to reproduce the bug?
5. Has there been an error message, if so, please provide it