Hi,
I have a strange issue suddenly. I cannot create or edit template anymore

When I attempt to edit any of the template in my site, I am presented with an error screen (see screenshot nb1) "connection aborted". And when I’m returning to see if the change were made anyway, the code is corrupted and incomplete (see screenshot nb2).
I’ve tried to reinstall modx several time.
I’ve tried 0.9.6.3-rc1, 0.9.6.2 and modx 0.9.6.1. with basic installation with and without the "test website".
I’ve also tried to install modx on 2 different server (PHP Version 5.2.0-8+etch11 and mysql 5.0.32) but the issue stay the same.
When I’m using firefox, safari or Internet Explorer on Mac and PC the issue is still the same.
I really don’t know what to do now.
(sorry for my bad english)