Apologies for taking a few days to get to this. It is turning out to be a busy spring (anyone do gravel driveway work in Lancaster County, PA? :-) )
Late last week, the server was rebooted by the host due to something on their end. When it came back up, a drive was mislabeled due to a configuration typo. This forum has tons of attachments and they take up a lot of space which required splitting the attachments directory into two. The drive that was attached with the wrong label was configured as the primary storage location for attachments. As you all know, that means that no new attachments could be saved and that the attachments added since that drive was added were not accessible.
Well, it is sorted out now. Apologies again.