I see the prob. It's a bit convoluted because we don't go through item_store when editing an existing post. There *is* an item_store_update that "should" to the right thing (untested), but we're only calling that for remote posts, and not local ones - where we just write the updates to the DB. That's where the sig is getting cleared. Probably need to convert the local update to go through item_store_update so we don't have to re-create all the filtering stuff (and ensure it all gets applied - which doesn't appear to be happening ATM)