I'm also having this in Lucid, you can test with terminal:
terminal in window mode:
notify-send -u normal 'Hi' 'Hello' -> shows properly
notify-send -u critical 'Hi' 'Hello' -> shows properly
terminal in fullscreen mode:
notify-send -u normal 'Hi' 'Hello' -> doesn't show
notify-send -u critical 'Hi' 'Hello' -> shows properly
I don't know if it's intentional, but for me it's a bug.
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notifications are not always on top of other windows
https://bugs.launchpad.net/bugs/331115
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