Ah, VirtualBox, that could explain it, at least for the guests. If Alt+click is intercepted by the host's window manager, VirtualBox guests don't get to see those events. You would have to make sure that both WMs use different mouse_modifiers.
For example, keep the guests at the default <Alt> and on the host run
gconftool-2 -s /apps/metacity/general/mouse_button_modifier -t string "<Super>"
Host at default and "<Ctrl>" for the guests appears to work too.
Anyway, Alt+drag was just meant to be a band-aid. The latest Onboard has window decoration disabled by default (by coincidence), which makes it harder to maximize in the first place. If you'd like to try it, Oneiric proposed has a slightly outdated version, testers welcome.
Ah, VirtualBox, that could explain it, at least for the guests. If Alt+click is intercepted by the host's window manager, VirtualBox guests don't get to see those events. You would have to make sure that both WMs use different mouse_modifiers.
For example, keep the guests at the default <Alt> and on the host run general/ mouse_button_ modifier -t string "<Super>"
gconftool-2 -s /apps/metacity/
Host at default and "<Ctrl>" for the guests appears to work too.
Anyway, Alt+drag was just meant to be a band-aid. The latest Onboard has window decoration disabled by default (by coincidence), which makes it harder to maximize in the first place. If you'd like to try it, Oneiric proposed has a slightly outdated version, testers welcome.