Yesterday I still got the normal homepage here, but today it looks like this. The forums themselves still look normal though. I wonder if it's something on my end or a website update gone wrong?

Yesterday I still got the normal homepage here, but today it looks like this. The forums themselves still look normal though. I wonder if it's something on my end or a website update gone wrong?

I've had that happen a few times, generally when the site is being very slow. I believe it is mainly an issue of being unable to load the site properly, which could have a few causes, most of them related to the stability of the connection.
If the problem has persisted since it first appeared, try the steps of rebooting the device that you are using, as well as cycling the router (powering the router down for 15-30 seconds by unplugging it at the device, not the outlet.)
While attempting to post that, it became clear that the site is in slowdown at the moment, so I'm inclined to say the problem may be at least partially on their end. If cycling/rebooting doesn't work, you may want to wait a day or two and see if the site/servers stabilize before doing any deeper troubleshooting on your end.