Maybe one for Oliver2002.

I had a very strange experience earlier this week at ZRH - I've never had this before:

• The day before the flight, online was throwing an error when trying to check-in for the flight, both app and website, so I could not retrieve my boarding pass
• On the day of the flight, I went to ZRH early and at the check-in counter, the agent was also unable to check me in and sent me to ticketing
• The ticket desk said there was nothing wrong with the booking / ticket and sent me to the specialist service desk
• The service desk agent was also unable to check me in on the booking initially
• It took several agents over an hour to resolve the issue
• He spent a long time on the phone with ADC carrier support / Altea support
• He told me it was something to do with IAPP overrides?
• He eventually contacted the station manager and got permission to override something in the system
• He also told me that they had never seen anything like this before.

Sounds like an LH IT special - it was the most inconvenient one for me yet.