We upgraded multiple RH10 Webhelp projects to RH2017 WebHelp with little to now problems. However, there is one project that will not cooperate. When the upgrade completes, the topics do not display in the topic list as expected. So I go to the Project folder and DON'T I see them there. When I go to the Broken Links folder they ARE there! I am restoring them one-by-one. Anyone else had this problem or know of a patch/fix?
Did you try renaming or deleting the project's .cpd file?
If deleting the cpd as Jeff suggests in RH2017 doesn't help, try doing it in RH10 first. And run the reports for broken links, unused files, etc to make sure everything is clean before trying to upgrade again.