[Evolution] Emails disappearing

[Carpetnailz <carpetnailz researchintegration org>]

When I try to open certain emails, "formatting message" flashes briefly
and then nothing. It seems to be ones that came during a certain time
period. It doesn't seem to be happening now.

When I view "All message headers" these show "X-evolution-source:local".

What could cause this to happen? I'm wondering if somehow the download
got interrupted and the messages are lost in cyber-space. But why would
the sender, recipient, subject and time info be there but nothing else?
Especially since it's for about 4 or 5 emails. If the download were
interrupted why would there be empty info on that many emails?

Is there any way to recover the content?

Thanks.