There was a reported bug associated with WysiwygPro under 
cPanel Filemanager that corrupts special characters and 
several page encoding when pages are saved.

If a page contains a counter or any other link that uses special 
characters is edited in the WysiwygPro editor, WysiwygPro 
evaluates these characters into ASCII representations and are 
never converted back before saving.  This isn't a problem with 
normal links to other pages containing scripts; however, to the 
counter and other images generated by scripts on the fly, it is.

We would like to advise all our clients to avoid using  
WysiwygPro until a bug fix is released.