Problems with mod_pagespeed apache module
— at Initial Version
When use mod_pagespeed for apache from http://code.google.com/intl/pl/speed/page-speed/docs/module.html. CKEditor have problems with loading files (css , js) after refresh (when pagespedd works). Remember that use of this module automatically set Accept-Encoding gzip,deflate headers. Because this module became more popular (it is installed on hosting) we should take care about it.
Please look at screenshots.
All test done with _samples/eplacebyclass.html with different CKEditor js files loaded.
Problem was reported by Drupal users http://drupal.org/node/1095908