Comment 3 for bug 66605

The option "Open links in new tab instead of in new window" refers to links inside Konqueror only.

So you did not "configure Konqueror to open links ___from other applications___ in the same opened window in a new tab."

I cannot confirm that this has been the case with Dapper either.

From which application are you opening the link? It's probably an application setting then maybe and/or you've configured something else differently on your Dapper install.