Relating to HUD on Ubuntu 12.04 -- When I activate the HUD with alt-key, the search bar appears at the top of my display, then it never goes away. It stays painted an always on top of other windows, but inactive. Any mouse events affect the window underneath. I killed the hud-service but it didn't help. I tried xrefresh with no effect. The only way I can get my display back to normal is to log off and back on. I disabled alt-key to avoid this happening again, but it seems like a bug.
I don't know if it's related, but when I activate Dash from the launcher, it appears normally, but any mouse event on any item in the Dash window causes the window to disappear and the window underneath (if any) receives the event. I can only use the keyboard to type and navigate around the window items. I mention it because Dash and HUD have a similar look and feel so might be related.