As part of my script before I run any of the regression code, I delete all the *.xml files from the results directory. This is done because if there is a _severe_ crash while running the regressions, the *.xml files will still exist when things are "collected". I've been told that it is the responsibility of process_jam_log to create these, BUT: C:\Projects\boost\tools\regression\build>C:\Projects\boost\tools\build\jam_src\bin.ntx86\bjam.exe -sTOOLS=vc7.1 ...found 481 targets... Traceback (most recent call last): File "regression.py", line 712, in ? commands[ command ]( **accept_args( args ) ) File "regression.py", line 356, in setup build_if_needed( process_jam_log, pjl_toolset, toolsets ) File "regression.py", line 288, in build_if_needed raise 'Failed to find "%s" after build.' % tool[ 'build_path' ] Failed to find "C:\Projects\boost\bin\boost\tools\regression\build\process_jam_log.exe\vc7.1\release\process_jam_log.exe" after build. the reason it cannot find it there is because somehow it got built here instead: C:\Projects\boost\bin\boost\tools\regression\build\process_jam_log.exe\vc7.1\release\threading-multi\process_jam_log.exe I don't know if actually finding the correct version will solve the white space problem, but this clearly isn't correct. Victor A. Wagner Jr. http://rudbek.com The five most dangerous words in the English language: "There oughta be a law"