Right click on a window and selecting Move to Another Workspace, and picking a workspace results in nothing happening. Move to Workspace Right/Left still function.
Does this also not work if you right-click on the menu item? Ie., right-click on the window, then *right-click* the menu item, rather than left-click.
Yikes, it does work that way, but why the difference between left click and right click?
It's bug in the GTK+ menu code I believe.
Reassigning gtk+ -> gtk2 (I doubt metacity is using gtk+ v1)
fixed in 2.12.0