I, too, have inherited this problem since upgrading to Lucid.  There are a few 
other characteristics which may help track down the issue:
  - Update Manager is the worst offender for triggering the problem and also 
reports that it cannot get mouse focus
  - Firefox is another program that will always trigger the issue
  - Most apps that have a Gnome right-click menu can be used to "escape" the 
block ...
    - Right click on the top menu of the window with focus
    - Right click on your target window
    - Start clicking in the target app
    - The tricky part can be finding the window that currently has the mouse 
trapped - particularly if it's buried
 - Occasionally I have had the situation where the mouse is focused in one 
window and the keyboard in another - particularly in an xterm.
 - Once stuck xev does not report window focus changes etc.
  - VMWare Player, as you might imagine, triggers this behavior and can render 
a machine almost useless

My hardware is as follows:
 - Intel Core 2 Quad Q8400
 - 8Gb RAM
 - Gigabyte EP45-UD3l mobo
 - Logitech wireless mouse
 - Gigabyte GV-R435OC-512I - ATI HD4350 based graphics card
 - ATEN CS62DU 2 Port DVI USB KVM 
 - SABRENT USB to PS/2 (Dual PS/2) Converter Adapter Cable Model SBT-PS2U
 - NMB RT8256CW keyboard (circa 1996)
 - assorted SATA disks etc.

I am running with ACPI=off noapic in the startup line (and still see all
4 cores in system monitor)

As much as I'd like to see this issue fixed I'm also prepared to buy a
different mouse if someone can assure me that the problem would go away.
I've almost got the point of turning the machine inside out and running
Windows 7 as the host with a Linux guest under VMWare.  However since I
run a mail server, samba domain controller, web server, mysql server
etc.  you can understand that would be a last resort!

Any advice gratefully received.  Also if you need me to test anything I
will be happy to help where I can.

Nick

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https://bugs.launchpad.net/bugs/375905

Title:
  Mouse focus gets stuck over control objects

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