As far as I can make out, this is the current situation:
Fourth Round:
Shelbourne v Athlone Town (NB now scheduled for 15 Apr)
Shamrock Rovers 1-0 Wexford Youths
Longford Town v St Kevins Boys
Bray Wanderers v Tolka Rovers*
St Patricks Athletic 3-1 Bangor Celtic
Sheriff YC 0-2 Dundalk aet
Drogheda United v Wayside Celtic
Bohemians 1-2 UCD
I haven't been able to confirm a scoreline for Tolka Rovers v Firhouse Clover (3rd Round), but I am assured Tolka won, with sources suggesting 3-1.
The matches in the Fourth Round should have all been at least fixed by now, but despite the LFA saying "Matches to be played before 28 Feb", no sign of dates for three of them!
Update: Longford today posted Tuesday 02 April for their match against St Kevins Boys. And NB See Drogheda fixture in Bullit's post above!