saga_cmd pj_proj4 does not output errors to a standard handle (stderr), so program that shells to saga_cmd can't detect them. Example:
Error: Proj4 [initialization]: projection not named
Error: executing module [Coordinate Transformation (Shapes)]
Even trying to redirect with ">" at command line fails - error message still displayed at console.
Tested with saga_2.1.0_20130517_win32.zip, but bug is also in Dec. 2012 beta.
Could someone check this? Should be easy to fix.