Character name: All active characters- first experienced this issue on 'Hayakke'
Character level: 111
Character job: Hayato
World name: Chaos
I also have been previously able to access the shop for the entirety of the event up until just yesterday afternoon. The date of the incident(s) were yesterday, August 22nd, and today, August 23rd. No matter what character I attempt to access the shop on, I am still unable to use it. I'm very worried that this will prevent me from participating in the event, as it closes on the 29th!
Thank you for posting this thread as well, I was beginning to worry that it was an isolated issue!