I don't know what caused the problems, but when we got back from our Sunday ride today, the forum wasn't working. After troubleshooting the problem for an hour or more, I determined the media gallery add-on was the culprit. So, until I have time to figure out why it's acting up, I'm disabling it.
If you uploaded a photo or something to the media gallery today and suddenly the forum stopped working, please let me know. It will save me a lot of time if someone can pinpoint a specific cause of the problem.