Mentoring discussion shows a blank page

I asked for mentoring for the Clock exercise in the Nim track and @siebenschlaefer kindly accepted the task. Yesterday I made the modifications the mentor suggested, submitted a new iteration of the exercise and replied to the mentor’s message in the discussion page. Today I received an email stating that I had a following reply, but when I tried to access the discussion page, it flashed the scaffold of the page followed by a blank page. I’ve tried several different browsers (Firefox, Chromium, Falkon) but they all behave similarly.

Any ideas about what might be causing this?

Do you have the URL pls?

Sure:
https://exercism.org/tracks/nim/exercises/clock/mentor_discussions/e268923d2d37489bb9846ae461d12db9