Re: Powerlinc 2414U not connecting with 4.1.17 update
The thread about the driver was for the 2412U or 2413U, not the 2414U. Instead, the Indigo installer installs the driver for the 2414U. So re-run that to see if it helps. But if just stopped working and you hadn't done an OS upgrade or anything, then the likely problem is a hardware (PowerLinc) failure.
Copy/paste the contents of the Event Log after you choose the Interface->Connect menu item so we can see the exact errors.