I wonder if it would help to clear the app cache (you may then need to re-login). Regarding it showing “trebuchet: nothing blocked” that may just be about the launcher itself not blocking anything since it doesn’t use network access. But when no other app is running, the iodé blocker will report it as the “current / active app”. Personally I find that notification a bit misleading, maybe we could submit an issue on it to the developers.
But back to your issue about the iodé blocker not working for other apps, do give app cache clearing a try.