PageBreak is not working in CMS 1.7.3 with linux

After includding a pagebreak function in a midle of an Article, pagination is not working.
The pagebreak grey bar is placed where I choose in the article, and the pagebreak plugin is published, but it's not working.

I tryed to replicatie the problem in a windows environment, and it worked properly there!
I upgraded the JCE Editor to 2.0.19, and replaced CSS (layout and template) with the same files I have in my Linux environment, where the issue occurs, and pagination stil worked in windows server.

Environment with pagination issue:
PHP Version: 5.2.17
Web Server: Apache

Environment with no issues, pagination working properlly:
PHP Version: 5.2.17
Web Server: Microsoft-IIS/7.0

In both I have installed:
CMS Joomla 1.7.3
JCE Editor 2.0.19

elanna wrote: Environment with pagination issue:
PHP Version: 5.2.17
Web Server: Apache
- WebServer to PHP Interface: apache2handler

Environment with no issues, pagination working properlly:
PHP Version: 5.2.17
Web Server: Microsoft-IIS/7.0
- WebServer to PHP Interface: cgi-fcgi

In both I have installed:
CMS Joomla 1.7.3
JCE Editor 2.0.19

Well my host provider suggested taht this issue could be in the PHP interface to Webserver... I should check all PHP parameters to find what is working better in Windows that not in Linux, and ask them for changig the parameter in LINUX to fix the issue...

Has someone a clue about it?

AdditionallY:
- It's nota template issue.
I tryed a Joomla template and I could replicate the issue...

That is maybe question for JCE provider company. Probably they have some minor bug like letter in wrong case because linux is case sensitive and windows is not.