Clicking on links in kmail does not always open up the link. For instance, a message with a url that points to a .pdf file should open up kghostview and open that file. Running kghostview and doing File->Open and pasting the url allows kghostview to open it without problems. In addition, triggering this from khtml works without problems. However in kmail, kghostview opens and the progress dialog sits at 0% forever.
Not a kmail bug in this case. *** This bug has been marked as a duplicate of 69456 ***