After reading the error log it sounds like the PHP ini_set function has been disabled by your host for some reason. This is causing an error to be displayed on the page, which then stops tiny_mce_gzip.phpfrom modifying the page headers later on in the script. 

ini_set is a commonly used function, I would wait for your hosting company to reply as they should enable it again.

Let me know what your hosting company says.

Thanks!

Greg

Again the Tiny MCE Editor is not opening in the CMS anymore, in the error log file I get:

[19-May-2013 12:01:27 America/New_York] PHP Warning: ini_set() has been disabled for security reasons in /home/echob123/public_html/beheer/3rdParty/tiny_mce/tiny_mce_gzip.php on line 212
[19-May-2013 12:01:27 America/New_York] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/echob123/public_html/beheer/3rdParty/tiny_mce/tiny_mce_gzip.php:18) in /home/echob123/public_html/beheer/3rdParty/tiny_mce/tiny_mce_gzip.php on line 226

Any idea what could have happend ??

I've contacted the host, but no reply yet.

Best regards,

Koen