--- Quote Start ---
I have a similar issue with Quartus V9.0sp2.
Although I've not verified it, I thought of this possible cause:
When I create a new symbol in a design, then I can always open with hierarchy.
If I copy and add the module files to another project, then hierarchy is not recognized, although compilation always succeeds, as in your case.
I can reactivate hierarchy if I force a create symbol.
My supposition is that the hierarchy information is stored in the project file or in project library when I create the symbol, so it is lost if you simply copy .bdf .qip. .vhd .v files and add them to the other project.
--- Quote End ---
I tried recreating symbols and replacing the old ones with no luck. The odd thing is that in the navigator hierarchy, you can right click on a bdf, select properties, and there you can see that it has the correct directory address for that bdf. Also, in the navigator under "files" and "design units", it can launch the bdf . I can also right click and successfully use the "locate" option for a bdf. Clicking on bdf symbols in a bdf window to go down the hierarchy works too.
Honored Contributor
