"last post by" is substantially broken in forum summaries Answered

Earlier today, RocketScientist2015 reported a bug with the forum topic lists, that "sticky" topics appeared to no longer be sticky.

In addition, it seems that the "last post by <user>" mechanism is broken. The attached three screenshots were taken within the past five minutes. You can see many "empty" fora, including the whole Marketplace (second).

There appeared to be a server outage last night around midnight. Could this be fallout from that?