Weird drawing

[Ann Bens]

I am getting this weird drawing again and forgot how to fix this.

Brush, eraser.

Is soon as I click it draws a straight line by itself.

[Semaphoric]

Do you have the shift key pressed?

[Ann Bens]

No, but I did used the shift key earlier. Might have been ' stuck' .

All is back to normal now.

Thanks.