[Zope] Mysterious reverting to previous code????

Has anyone noticed their dtml code mysteriously reverting to a previous iteration of code??? Possible after a manual shutdown and restart. In other words suppose you have a dtml document called DocA. It contains: <!--#var standard_html_header--> <h1><!--#var document_title--></h1> <!--#var standard_html_footer--> You test this doc and it displays fine. Several days later you change DocA to: <!--#var standard_html_header--> <h1><!--#var id--></h1> <!--#var standard_html_footer--> You test this doc and it displays fine. Later that day or several days later, after a manual shutdown and restart, DocA has reverted to: <!--#var standard_html_header--> <h1><!--#var document_title--></h1> <!--#var standard_html_footer--> DR