I've had this same issue... The only machine it's occured on for me is running the proprietary Nvidia driver. What video driver is your machine using?
** Changed in: Ubuntu
Sourcepackagename: None => tsclient
Importance: Untriaged => Medium
Status: Unconfirmed => Confirmed
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GNome not response when terminal server is open and screensaver run
https://launchpad.net/bugs/49562
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