Yep - I tried to buy two tickets for Roxy Music in Glasgow after logging in to Irish Ticketmaster site today.
Got the tickets and then tried to pay with Paypal which they then said they were not currently accepting.
Added my card details but then it rejected my Irish postcode.
No e-ticket option either. So this is possibly a Brexit thing but I spent a good bit of time on there before it failed with no obvious message to warn me in the first place.
Just an update to say I checked back on the site later in the day and low and behold it allowed me to book tickets with paypal, though it wouldnt accept my debit or credit card and said they were blocked.
e-ticket option was also available as were lots more options for varied price tickets.