Hello, I am using Ubuntu 8.04 (Hardy-Heron), and have installed a package (cannot remember which), that I could customize the Gnome GUI slightly more. It appears that this program just enabled a setting that is normally hard to find, and did not merely "create" a setting. The setting I enabled was the ability to remove the menu bars of most (if not all) programs. Anyways, I right clicked the volume control applet, clicked open volume control. When the window popped up, I dragged the menu bar off of the window (to test it out). And now I cannot put it back on, every time I click and hold to drag it back, the entire (2) windows completely disappear. The detached menu bar also appears on the taskbar, so I right-clicked that and went to move, and trying to move it back where it was, has no effect, it just doesn't want to reattach. This is a really strange bug...
Thanks for reporting this bug which I can confirm. I have assigned it to the package gnome-media.
The application you used to set the open was probably gconf-editor.
To restore the window menu you need to delete a file. Open the file browser using "Places->Home Folder" and toggle the location bar to text (the button is top left just below the menu bar). In the text line, append "/.gnome2" to the line (note the dot). In this folder you should see a file called "gnome-
To switch the menu tearoff option off, you need to run the config-editor again. Be careful, you can change many things using this application! Press alt-F2 and type "gconf-editor" into the dialogue then click "run". Expand the "desktop" branch, scroll down and click on "interface". Scroll the right-hand window down until you can see "menus_