Ville, I've had the same issue with windows completely disappearing. The workaround is to completely disable the screen saver:
* sudo apt-get install xscreensaver
* Start scrensaver from the main menu
* Disable the screensaver by setting Display Mode to "Disable Screen Saver", and in Advanced uncheck "Fade to Black when Blanking"
* sudo apt-get remove gnome-screensaver
Now the windows only move between monitors instead of completely disappearing.
Hopefully the workaround for monitors turning off/on - window position memory - will be enabled at some future release.
Ville, I've had the same issue with windows completely disappearing. The workaround is to completely disable the screen saver:
* sudo apt-get install xscreensaver
* Start scrensaver from the main menu
* Disable the screensaver by setting Display Mode to "Disable Screen Saver", and in Advanced uncheck "Fade to Black when Blanking"
* sudo apt-get remove gnome-screensaver
Now the windows only move between monitors instead of completely disappearing.
Hopefully the workaround for monitors turning off/on - window position memory - will be enabled at some future release.