I'm not sure I follow here. Do EACH of the CHMs involved have references to all the others? Normally you only have the master or parent with the TOC configured to look at and include child links. But each of the child CHM files has a basic TOC and really knows nothing about the others unless the parent is opened and it finds the children.
Sorry, but the behavior you are describing seems perfectly normal to me and the behavior you cite with version 8 seems abnormal.
Helpful and Handy Links
Thank you. I have fixed the problem.
I had installed the second update to RH9 where the bug was supposedly fixed. However, it didn't help.
But, then I decided to take the RH8 files again and upgrade them again with the newest version of RH9.
The merged CHMs now work.
Rick, we broke up our Help into different CHMs, because the Help is very large. Plus, this way the user also gets more information in the Search pane using the Location column. So, they can see if the search result is in the Technical Notes section or in the Concept Papers section. However, we want the end user to feel like it is all one big Help and not 6 separate ones.