The out redirection file is not located in temp dir but in the batch files location. Due to missing file permissions in "C:\Programs\..." the file cannot be created.

This is a fixed an therefore working version of bbox.bat:

@echo off
qcad.exe -no-gui -allow-multiple-instances -autostart scripts\Pro\Tools\BoundingBox\BoundingBox.js %0 %* 1>%temp%\bbox.log 2>&1

type %temp%\bbox.log
del %temp%\bbox.log