Steps to reproduce:
1) Click on 'Resolve' on an issue
2) Add some comment in the window
3) Click 'Change'
4) Unexpected error.
Is this still an issue? Can you provide me with more details?
Its still an issue with Firefox (27), but not on Chrome (33).
I'm unable to reproduce this on FireFox (28) or any other browser.
If this happens consistently for you, can you open firebug and look at the actual Ajax response document? That might reveal some more info.
This issue is being closed due to inactivity. If you're still experiencing issues, please contact firstname.lastname@example.org. Thanks!