Mouse not working in KDE after upgrading to FreeBSD 10.0

[Jerry]

I was running the last BETA release of FreeBSD until this morning. Having
nothing better to do, I used "FreeBSD-update" to install the latest
version. Everything appeared to go fine. However, I now find that the mouse
will no longer work in KDE. This is a portion of the Xorg.0.log file:

(II) config/hal: Adding input device Microsoft 2.4GHz Transceiver v7.0
(II) LoadModule: "mouse"
(II) Loading /usr/local/lib/xorg/modules/input/mouse_drv.so
(II) Module mouse: vendor="X.Org Foundation"
 compiled for 1.7.7, module version = 1.9.0
 Module class: X.Org XInput Driver
 ABI class: X.Org XInput driver, version 7.0
(**) Option "Device" "/dev/ums0"
(==) Microsoft 2.4GHz Transceiver v7.0: Protocol: "Auto"
(**) Microsoft 2.4GHz Transceiver v7.0: always reports core events
(**) Option "Device" "/dev/ums0"
(EE) xf86OpenSerial: Cannot open device /dev/ums0
 Device busy.
(EE) Microsoft 2.4GHz Transceiver v7.0: cannot open input device
(II) UnloadModule: "mouse"
(EE) PreInit returned NULL for "Microsoft 2.4GHz Transceiver v7.0"
(EE) config/hal: NewInputDeviceRequest failed (8)

This is what it looked like when things were working:

(II) config/hal: Adding input device Microsoft 2.4GHz Transceiver v7.0
(II) LoadModule: "mouse"
(II) Loading /usr/local/lib/xorg/modules/input/mouse_drv.so
(II) Module mouse: vendor="X.Org Foundation"
 compiled for 1.7.7, module version = 1.9.0
 Module class: X.Org XInput Driver
 ABI class: X.Org XInput driver, version 7.0
(**) Option "Device" "/dev/sysmouse"
(==) Microsoft 2.4GHz Transceiver v7.0: Protocol: "Auto"
(**) Microsoft 2.4GHz Transceiver v7.0: always reports core events
(**) Option "Device" "/dev/sysmouse"
(==) Microsoft 2.4GHz Transceiver v7.0: Emulate3Buttons, Emulate3Timeout: 50
(**) Microsoft 2.4GHz Transceiver v7.0: ZAxisMapping: buttons 4 and 5
(**) Microsoft 2.4GHz Transceiver v7.0: Buttons: 5
(II) XINPUT: Adding extended input device "Microsoft 2.4GHz Transceiver
v7.0" (type: MOUSE)
(**) Microsoft 2.4GHz Transceiver v7.0: (accel) keeping acceleration scheme
1
(**) Microsoft 2.4GHz Transceiver v7.0: (accel) acceleration profile 0
(II) Microsoft 2.4GHz Transceiver v7.0: SetupAuto: hw.iftype is 4, hw.model
is 0
(II) Microsoft 2.4GHz Transceiver v7.0: SetupAuto: protocol is SysMouse

Absolutely nothing else was updated except for FreeBSD itself. I have tried
rebooting twice with negative results. I can see the mouse pointer in KDE,
but I cannot move it. However, in the CLI environment, the mouse works
normally. I don't even know where to look to correct this problem.

-- 
Jerry