As suspected, you must be running an older version where this must have been an issue.
Can you please download v4.1.2:
http://www.iarchitect.net/Uploads/106/SGv4.1.2.zipIt's not a complete installation package (beta release...it's been thoroughly tested).
Just unzip the files to the software installation directory (and overwrite the existing versions).
Default installation directory: C:\Program Files\iArchitect\iArchitect Sitemap Generator\
After trying it out, please let me know how it works.
Thanks,
Brian