During the time this forum was down, and still going on though last Thursday (07/02/2020) the last time I attempted to complete a challenge, There have been some problems submitting the solution to tutorials. Most of the time I just had to press the submit button multiple times, experimenting with the ones that I knew were correct, but some of the other challenges the test said that it timed out. I checked the solutions and they were correct. I refreshed the page and after a few attempts, it finally ran the test.

I am not sure if these issues were related to the ones that you had on this forum, but I thought it would be best to bring them to your attention in case you were unaware of them