Selenium Server on CentOS 6.2 has no keyboard input while testing - firefox

We currently have a problem with SeleniumServer which is troubling me for 2 days, now...hope you can help me.
The Selenium Server is running on a CentOS 6.2, Selenium Server is 2.21 and Firefox is 10.0.4.
When a test is starting up, SeleniumServer launches Firefox but he can not type anything in the form fields or press "Enter" to submit.
Even better, no one (not even me with VNC-Server) can write something in the form field, url bar, menus, press a key like "Enter", etc....it is as the keyboard is not present... It´s like Firefox is locked somehow.
If a start Firefox with Interactive-Mode : selenium-server.jar -interactive & cmd=getNewBrowserSession&1=*firefox&2=http://www.google.com everything is working fine, I can do all the tests manually.
I can also start firefox manually with just typing firefox in the shell and that is working fine, too.
So what is going on in Selenium and how does Selenium starts Firefox? Why is no Keyboard-Input available when running a Selenium-Test with SeleniumServer?
We tested with MacOS and Windows, too and both working fine with the same test.
Any idea would be appreciated.
Greetings from Berlin

Fixed it myself with an older version of Firefox. Firefox 7 worked for me.

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Check this link.
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