The update applies a definitive fix for the class extension hack, based on suggestions from @Xon.
The update is backward-compatible with our add-ons, so applying the update will keep the current hack active, however, once you have upgraded other our add-ons to the latest versions (new versions of all Filter add-ons will be released within 24 hours to support the new system), you can disable the hack by unchecking the option Legacy Class Extension Hack in add-on options page. Once unchecked...