Glitch - variable speed, even though a fixed speed has been programmed

[EKF]

Hi
The problem is specific to this laptop. It works on a very similar laptop (although we initially had a speed issue and removed the antivirus software to solve this). I've also realised that the issue is in one direction only (we have a .txt file as input and east-west is working normalliy, but north-south seems to be exponentially speeding up along the path).

I've pasted our keyboard info below:
def checkKeyboard():
MOVE_SPEED_MULTIPLIER=0.6
ROTATE_SPEED_MULTIPLIER=0.6
tomove = 0
torotate = 0
#print 'viz.key',viz.key

if viz.key.isDown(viz.KEY_UP):
tomove = mazeExptParams.MOVE_SPEED*MOVE_SPEED_MULTIPLIER
elif viz.key.isDown(viz.KEY_DOWN):
tomove = -mazeExptParams.MOVE_SPEED*MOVE_SPEED_MULTIPLIER
elif viz.key.isDown(viz.KEY_RIGHT):
torotate = mazeExptParams.ROTATE_SPEED*ROTATE_SPEED_MULTIPLIE R
elif viz.key.isDown(viz.KEY_LEFT):
torotate = -mazeExptParams.ROTATE_SPEED*ROTATE_SPEED_MULTIPLIE R
elif viz.key == viz.KEY_F1:
torotate = -mazeExptParams.ROTATE_SPEED*ROTATE_SPEED_MULTIPLIE R
viz.move(0,0,tomove)
viz.rotate(viz.BODY_ORI,torotate,0,0)


Thanks
Emily