Please describe the problem:
I'm using a Tablet PC, with Wacom Penabled drivers installed (v4.82-9).
Gimp works well when Tablet is in landscape mode. However, if orientation is
changed to portrait mode the mouse cursor will behave normally, but the brush in
Gimp will draw at 90 degrees to what the curor is doing, with an offset. 

It's as if Gimp is still using the pen settings before the tablet orientation is
changed. 

This occurs in portrait mode irrespective of if Gimp is loaded before or after
the change of orientation.

Steps to reproduce:
1. Change TabletPC orientation to portrait.
2. Try to draw anything.


Actual results:
The cursor will behave normally, but the Gimp brush draws at 90 degrees to what
the cursor is doing (moving cursor right, draws upwards, moving upwards draws
left, moving left draws down and moving down draws right).

The cursor and the brush axis intercept at the centre of the screen.

Expected results:
The brush should follow the cursor movements.

Does this happen every time?
This occurs every time.

Other information: