Can't link to projects in merge projects - RH8

I generated my merged file in RH8. However, I can't link between the merged projects.

I accesss the parent project and then click the link and successfully access the child1 project. Then I click the link in child 1 to go back to the parent and it doesn't work. I get the message that Explorer cannot display the web page.

All my files are on my C drive and I checked the links and they look ok.

Also, when I allow blocked content, I get two bars at the top of the window with the Contents, Index and Search instead of the usual one.

Any help is appreciated.

Thank you.