Having this issue as well on 15.10.
Partial fix: After killing gnome-screensaver from a TTY, I've found that running:
gnome-screensaver-command -a
activates the screen saver, but once unlocked, eliminates the screen-blanking problem that Tony Maro described.
Will also try "gnome-screensaver-command -d" instead of killing gnome-screensaver next time it happens to see if it works better.
Having this issue as well on 15.10.
Partial fix: After killing gnome-screensaver from a TTY, I've found that running:
gnome- screensaver- command -a
activates the screen saver, but once unlocked, eliminates the screen-blanking problem that Tony Maro described.
Will also try "gnome- screensaver- command -d" instead of killing gnome-screensaver next time it happens to see if it works better.