Confirmed still happens on Kbuntu 8.04 w/Compiz.
meisterplanlos' fix from above (disable Compiz's main run 'key binding', and bind alt-f2 to the dcop command line in Compiz's 'commands') works a treat.
Interestingly, I have the same problem at work on OpenSUSE 10.3 so will try the same fix there
Confirmed still happens on Kbuntu 8.04 w/Compiz.
meisterplanlos' fix from above (disable Compiz's main run 'key binding', and bind alt-f2 to the dcop command line in Compiz's 'commands') works a treat.
Interestingly, I have the same problem at work on OpenSUSE 10.3 so will try the same fix there