When trying to preview a page, which had been converted to RW8, I get the following NEW (I used to be able to preview) error message: “NSUnknownKeyException: [<MyDocument 0x7f89db33d850> valueForUndefinedKey:]: this class is not key value coding-compliant for the key _exporter.”
I think the answer here was to update plugins. So I’ll just leave a link here to all those LogHound updates, just in case someone else has the same issues.