Please describe the problem:
Clicking the middle mouse button, the mouse cursor changes correctly its shape,
but neither does it have the functionality of Auto Scroll nor is it possible to
change the cursor back to 'normal mode' and it's necessary to kill epiphany and
restart it.

The problem didn't exist from the beginning but rather happend after quite some
time of well working.

Steps to reproduce:
1. select Tools->Extensions->Auto Scroll
2. click middle mouse button
3. try to scroll or exit 'scroll mode' by clicking middle button again


Actual results:


Expected results:
beeing able to scroll using mouse movement and end 'scroll mode' by clicking on
middle mouse button

Does this happen every time?
yes

Other information: