The issues that started occurring on Sunday turned out to be more serious than anticipated, extending beyond the application code. We are still working on resolving them to ensure the proper functioning of the website, but we need some more time. Apologies for any inconvenience.
I have noticed a few (Error 50x) appearing especially if I sort by new. A sort of work around I have found is going to someones username to see what they post.
This post for example did not appear but I was able to find it by going to moderators in the sidebar and clicking Ernest.
Working on Kbin is a lot of work and as far as I know Ernest is a solo dev. So we should be patient and give him all the time he needs.