http://musicbrainz.org/release/47fb53be-6c7a-47e4-92a5-eb94b9fd6986/edit
=> Changing release artist credit from
"Ludovic Navarre"
to
"Ludovic Navarre" (artist1) aka (join phrase) "Ludovic Navarre" (artist2).

1. Open Release Editor
2. Edit release artist credit as explained above
3. Click on Edit Note tab
4. Click on Enter edit

Browser: Firefox 5.0 (either on Ubuntu or Windows 2000).
Greasemonkey: disabled
Browser cache: reload forced

Hint for developers:

• check if both web servers have static resource correctly regenerated
• check logs, I guess a stack track has been generated