Does motion log whether it's using a mask file? I've set one up and
modified my config file accordingly:
# PGM file to use as a sensitivity mask.
# Full path name to. (Default: not defined)
# Dynamically create a mask file during operation (default: 0)
# Adjust speed of mask changes from 0 (off) to 10 (fast)
I've checked the motion logfile but there's no reference to whether the
mask file is being read.
Motion version: 3.2.11 on Ubuntu Jaunty