All of a sudden, in Lion only, messages with attachments in Apple Mail are being shown as raw source, and I can't extract the attachments (and I can barely read the message). Here's an excerpt that shows what I mean:
And so on. That's a PNG image attached to the message, but I can't extract the image. There's no way to get a different view of the message; none of alternatives under View > Message are enabled. If I use a different computer, running Snow Leopard, I can receive this same message and it displays normally (with the image shown inline) and I can extract the attachment. What might be the cause of this? Thanks.