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Were you upgraded to version 10.10 ?
Is there a report that can be run to show client versions? Doesn't gotowebinar prompt people to upgrade their clients if they're not up to date?
I wish I had been upgraded to 10.10. I don't understand why all accounts are not upgraded at the same time. Between the systemwide audio failure on June 2 and the polling issues - mind you we run over 20 polls in a 7 hour session - I feel the need to create a backup Webex to ensure our training sessions can conintue.