Okay, thanks to a number of helpful bug reporters, folio has been updated to v.62. Highly recommended update, as it fixes a large number of issues.
Again, after updating from an older version, be sure to run the /mod/folio/html/setupdb.php page when logged in as news to update the db.
I haven't tested it, but am told that folio works fairly well (but not perfectly) with the forum plugin.