I can confirm Gabriel's comments:
* This happens at least since breezy for me
* I also found it's related to X screensaver and *not* to windows screensaver
(at least when the gnome screen saver is set to lock the screen)
* I also found that the bug is trigered when rdesktop is running in foreground
(has the focus)
* if you kill gnome-screensaver you get control of you PC again
for users with less expirience here are the steps to bypass the problem
when it occurs:
1) hit Alt+F2 and bring up the Run Application
2) enter the following command and check the "Run in terminal" option
sudo killall gnome-screensaver
3) a terminal window will popup and ask for your password - enter it
the steps above stop the screensaver, to start it again you must hit Alt-F2 and
execute the command:
gnome-screensaver
--
windows screensaver makes X mouse cursor disappear
https://launchpad.net/bugs/24305
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