Problem with invitations

[me...@unl.edu.ar]

Hello,
I have some problems with the invitations to a private conference room.
The link opens the room but doesn't load the list of users connected  
and the whiteboard.
Using:
Server: Open Meetings 2.1 (installed in Debian Squeeze)
Client: Internet Explorer 8 (Windows XP)
In some PCs with Windows & IE or FF works, in others, no. Using Google  
Chrome, works fine.
Seems to be a problem with versions of java or flash, but in some PCs  
with the same versions of java and flash works but no in others.

I've attached the logs files, these show lots of java errors but I  
can't figure out what the problem is.

Regards

Matias


/* --------------------------------------------------------------- */
/*                      Matías A. Eberhardt                        */
/*                                                                 */
/*                     Centro de Telemática                        */
/*                      Secretaría General                         */
/*                UNIVERSIDAD NACIONAL DEL LITORAL                 */
/*      Pje. Martínez 2652 - S3002AAB Santa Fe - Argentina         */
/*           tel +54(342)455-4245 - FAX +54(342)457-1240           */
/* --------------------------------------------------------------- */