Amaya crashes when editing amaya.css and browsing xhtml file

Hello,
I've loaded both amaya.css and an XHTML page with specific elements 
linked to a namespace.
After editing amaya.css, when I save it, amaya crashes (Irrecoverable 
error...).

No proble to save edited amaya.css independantly.

But it did not happen each time I tried it.

nicolas