The images depicting the error with points snapping to a line vector are in the Snap_point_error_images.zip file

The GRASSscript_LRS.txt file is a POSIX shell script ... 
I'd just open it in a text editor like Notepad++, 
Run GRASS 6.4.4 with MSYS 
Create a WGS1984 GCS location called latlon in C:\GRASSDATA 
Create a mapset called LRS
Extract the compressed LRS folder into C:\GRASSDATA\latlon merging the folders
I included the maps which are having the issue snapping points to the stream vector...
the stream vector is stream_clean
the point vector is gauges
the connectors from the points to the stream vector is connectors
the "snapped" points is crosspoints_err

If you want to rerun the commands and create new maps, then copy/paste the lines from the GRASSscript_LRS.txt file

The supporting DEM (raster) to create the stream is DEM_mask
The stream vector is created by running r.stream.extract and is stream_ext

There are notes worth reading regarding issues with v.clean, etc. located in the comments within the shell script.

Thanks!
Chris