More trouble. After edit of the httpd.conf file to change w:// to w:/, and restarting UniServer using "run_as_program" option (which worked fine prior to using the drive w option), that option now fails to get Apache working (Apache crashes though continues to show up as started). Now also, i noticed, using "run_as_program" doesn't change the w:/ references to c:/ etc. in the httpd.conf file (even after doing "remove_drive_w.bat" first). I then did "run_as_program" through a fresh install of UniServer in a separate folder, but no go there either, though the httpd.conf file in that install has the c:/ and not w:/ references. If I run it using "run_on_drive_w", Apache seems to work fine then. Will see later if a reboot re-sets things to normal... but what's going on otherwise?