Taken from the config.txt file in mame
Controls whether or not MAME makes use of mouse controllers. When
this is enabled, you will likely be unable to use your mouse for other
purposes until you exit or pause the game. The default is OFF
(-nomouse).
In the mame.ini file I changed the mouse to 1 and now everything works.
#
# CORE INPUT OPTIONS
#
coin_lockout 1
ctrlr
mouse 1
joystick 1
lightgun 0
multikeyboard 0
multimouse 0
steadykey 0
offscreen_reload 0
joystick_map auto
joystick_deadzone 0.3
joystick_saturation 0.85
natural 0
joystick_contradictory 0
coin_impulse 0
#