There were problems as far back as the Arsenal game, when the club repeatedly told us, that we hadn't had a cup game at home to test the new system, which has been in place since last summer.
I replied that we'd had a home cup game against Cheltenham last August. That was ignored, and, for good...
This new ticketing system is not customer friendly. It wouldn't hurt the club to put clearer instructions on the site, and when there are 'known issues' to publish that on the front page. Customer service is everything.