Serious problem: text disappeared everywhere

["Yang Sheng" <yasker@gmail.com>]

Hi 

These days I found I almost can't work with my KDE, because it seems there are some terrible error with text rendering engine(pango?). Just when I writing this post, the text I inputed would disappear after I changed lines or insert words . And this appearance not only appeared in the my firefox(it appear only in firefox early days,andnot serious), but also any program run in KDE. And the text may appeared again after I selected the blank.
I was driven mad. The text disappeared at least ten times when I wrote this post in gmail. 

Can anybody know the reason or help me to solve it?

 I am using Debian Etch(testing) and all packages have already updated to the lastest. Linux kernal is 
2.6.16.

Thanks 

-- 
regards, 
Yang Sheng