[Mediawiki-l] math formula gives Failed to parse

[Frames Project]

*Hello,

I have installed two identical  Mediawiki, on the same machine and the 
same disk.
Each Wiki belongs to a different user.

One of them works fine with <math> </math> while the other gives :

*Failed to parse (Can't write to or create math temp directory): \sqrt{x}*
**
*I checked permissions, texvc behavior etc...  everything seems ok.*
*Is the message hiding something else ?*
**
*Thanks for helping.*
*Francois Colonna **
**