If you change the Fact type on an existing Fact from say Settlement to a custom Fact, say Electoral Roll, any attached photos/documents attached to the fact become detached after selecting OK. The photos/documents then have to be reattached to the fact, which is a pain if you have a lot to change as I did.
Thank you for noticing and we appreciate you reporting it! It is indeed a bug in our system and I've forwarded it to our developers and they should start working on it to fix in the new version.
Please, let me know if you have any additional troubles and I'm so sorry for the frustration.