From Debian bug report http://bugs.debian.org/396915. This had been reported under 2.2.13 but apparently is still present on 2.4.0rc2.


I have a wacom intuos 3 and 4 extended input devices: Pad, Stylus, Eraser and Cursor
and my normal usb mouse, all generating core devices.

They all work fine with x-apps, and xinput shows that all wacom devices
are properly working.

Initially, all extended input devices in gimp are set to "Disabled". In
that mode, all wacom devices work like my normal mouse (as expected).

After enabling any extended input device (by setting it from "Disabled" to
"Screen" or "Window" in preferences), that device works as expected: it
becomes an independent device with its own tools.

However, the normal usb mouse stops working in the image window. That is,
evrywhere in the gimp it continues to work, except when over the image
area of any image window: over that area, it doesn't have any effetc (left
mouse doesn't draw, middle mouse doesn't drag, right mouse shows no menu).

The device dialog shows the four extended input devices in addition to the
"Core Pointer". Selecting a tool witht he core pointer works and changes
that steting.

So everything works _except_ that over an image area, the core pointer is
dead.

It starts working again imemdiately after i disable all extended input
devices.

I nuked my .gimp-2.2 directory with no effect regarding this.

Obviously, the core pointer should not stop working just because i have
enabled another extended input device.