I've tried gnome-launch-box on both 7.10 and 8.04 (fully updated), and I can confirm this bug.
First time I run it it runs fine, but the second time it always fails, and I have to kill gnome-launch-box. The "dialog" opens up, but it doesn't respond to keyboard input, like in the description above.
gnome-do seems to work, so you might want to try that out until it gets fixed.
I've tried gnome-launch-box on both 7.10 and 8.04 (fully updated), and I can confirm this bug.
First time I run it it runs fine, but the second time it always fails, and I have to kill gnome-launch-box. The "dialog" opens up, but it doesn't respond to keyboard input, like in the description above.
gnome-do seems to work, so you might want to try that out until it gets fixed.