For unknown reasons, Fldigi no longer starts on my iMac (mid-2011) OSX 10.13.6 when logged in as a user. WSJT-x runs fine, so it's not a problem with the rig or my Signalink. I was running Fldigi 14.1.08. I tried deleting and reinstalling it, which did not correct the problem. I tried version 14.1.14 with no luck either. It will run if I log in as administrator, but not if I am logged in as a user. I always run my computers from a user account, not admin. What happens is that, when I try to start up Fldigi, the icon shows up in the Dock momentarily, then disappears. Like it's starting to start, then changes it's mind. There was an OS X upgrade recently to 10.13.6 from 10.13.5, I believe about a week or so ago. I did use Fldigi some time after that upgrade, however, so I don't think it is related but am not sure. I can't find anything in the console logs that I can make any sense of. Any suggestions, tips? I don't know where to go from here, other than to switch to the admin account whenever I want to run fligi, which would be inconvenient. Anyone else running Fldigi on a Mac operating under OS X 10.13.6 ? I guess I am assuming that something got corrupted somehow, something that is not fixed by simply deleting and reinstalling the application. Is there some hidden files associated with fldigi that should be deleted, too?