Hi, i'm having a weird error case on Haiku : keymap is working, iroster isn't working (returning B_ERROR). Both use the same communication mean with input_server, but with the second one the message isn't directly processed by InputServer class but instead AddOnManager with : in InputServer::MessageReceived() fAddOnManager->PostMessage(message); This is working on R5 so i suspect Haiku application kit is faulty here. In my case, it seems it can't reply to the original sender, once a message was forwarded. Has this been tested ? in AddOnManager::MessageReceived() reply.AddInt32("status", status); message->SendReply(&reply); Bye, Jérôme