Main menu's submenus jump back up after scrolling down

[themuddler]

Binary package hint: xorg

What happens:

Using a mouse, I enter the System, then Preferences, menu from the 'main menu' applet in the toolbar (the compact applet which is a single ubuntu icon - not the one with apps, places and system as separate main menus). The height of the preferences menu exceeds the screen height so a small triangle at the bottom allows me to scroll down if I hover over it. The problem is, having scrolled, if I then move my mouse up to select, say, 'Startup Applications', then the menu instantly jumps back to the top. A workaround is to select using cursor keys.

What should happen:

After scrolling down, the menu should remain at the position I leave it once I move the mouse cursor away from the down triangle tab.

Using the 10.04 beta. Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
Architecture: i386
Date: Sun Apr 11 08:47:38 2010
DkmsStatus: Error: [Errno 2] No such file or directory
InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
MachineType: ASUSTeK Computer INC. 701
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-19-generic root=/dev/mapper/sda2_crypt ro quiet splash
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 01/08/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0801
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 701
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTek Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0801:bd01/08/2008:svnASUSTeKComputerINC.:pn701:pvrx.x:rvnASUSTeKComputerINC.:rn701:rvrx.xx:cvnASUSTekComputerINC.:ct10:cvrx.x:
dmi.product.name: 701
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-19-generic

[bruno.braga (bruno-braga)]

The only way to reach the options below the arrow is by keyboard.
Ubuntu 10.04 64-bit