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[Jim Thomas <665546@xxxxxxxxxxxxxxxxxx>]

Adding to my previous comment.  What I described above was after a new
login.  Also in every case when hovering over the menu selection and
sliding right the popup does eventually display when the mouse goes off
the right of the menu.

Having run through all the menus and repeatedly verifying that they all
popped up on the first visit I did the following:  Right click
Applications, select edit menus and then select close without doing
anything.  That seems to have flushed some but not all popup menus and
the ones that don't come up on the first try are not always the same.

This makes me think that we are definitely dealing with something
related to the creation of the menu display taking too long for the menu
to be generated.  It could be from the lookup of the menu definition on
disk, finding the icon files, doing the drawing of the menus etc.  My
best guess is that it is either a timeout on the lookup/display or
something related to mouse hover timing that creates a sort of race
condition that cause the menu to not display.  I don't know enough about
how the displays are generated to know whether this lies on the Gnome
side or Compiz or X11, but given that just bringing up the edit
applications dialog regenerates the problem I'd track down the problem
by looking in Gnome first -- what does opening that dialog do -- and
trace it from there into X11, GTK, Compiz, or wherever.

I'm using a fairly high end system -- AMD quad core, 8GB ram, SSD, I
wonder if this problem is more pronounced on a system with far fewer
resources.  That could be another clue.

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https://bugs.launchpad.net/bugs/665546

Title:
  Drop and sub menus don't always show up