Compose mail problem ?

[dommorsp]

Hi,
I have a problem with a particular user which is, since recently, unable to open the "new mail composer" window.
The window is stalled at "loading in progress", and a javascript error with concat_all.js is showing up into firefox ...
This problem occurs only for one user, and only in the "new mail composer"
He can browse into new event or new contact without any problem...
Moreover, other users doesn't have any problem with it...
I just noticed that this user can't change any settings for mail compose preferences ...
Anyone having any clue about it ?
Thanks in advance for your answer.