Please read this first, if you experience any problems. It might already answer your question. This is a closed thread, that will be updated by the admin if needed.
Why is there a trailing number in the filename of my .obs file? This is perfectly fine. As you might have set a number of center points, the plugin will create a .obs file for each of them. The files are numbered at the end of their filename starting from 0.
Why is my .obs file empty? If you recieve an empty .obs file (an empty text file with only a header stating "# RayMan Pro obstacle file #", please make sure all of your input files are in a metric projection. If you are using a degree projection the obstacles will get lost in rounding (and RayMan requires meters anyway).
Why does my .obs file contain awfully large numbers? In case you recieve an .obs file with huge numbers (huge distances to the center point) please make sure all of your input files are using the same projection.