This can be due to a number of many, very different reasons:
- Wrong/No Activity: the Harmony® remote will only send your button presses to Remote Buddy if you've selected the "Remote Buddy" activity. Activities on the Harmony® remote are chosen by pressing one of the buttons from the "Music, TV, Movie" row at the top of the remote. Please note: short and long presses of these buttons can select different activities.
- Bluetooth turned off: please make sure that Bluetooth on your Mac is turned on.
- Harmony Hub not paired: the Harmony Hub sometimes looses the Bluetooth pairing when making changes to its configuration. To initially establish - or re-establish - a Bluetooth pairing between the Harmony Hub and your Mac, follow this guide:
- Soft keyboard pairing: make sure you only have paired your Harmony Hub to your Mac as a "Sony Playstation 3". If you also pair your Harmony Hub as a soft keyboard, Remote Buddy will no longer be able to capture input events coming from it. Why is this? In "Sony Playstation 3" mode, the Harmony Hub identifies as "Consumer Control" device to your Mac. For this class of devices, any app is allowed to exclusively capture all input. For keyboards, however, OS X only allows access to apps running with root/administrator priviledges, locking out Remote Buddy. To properly remove the pairing as a keyboard, first use the Harmony in that mode, then remove "Harmony Keyboard" from System Preferences > Bluetooth - and finally remove the respective device from your Harmony's configuration. Since OS X caches the identity of Bluetooth devices, it may take some time, several attempts and maybe even a system restart before OS X sees your Harmony Hub as a "Consumer Control" device again and again allows Remote Buddy access to it.
- Empty batteries: if you can't control any devices with your Harmony® remote at all, while using the "Harmony Control" app on your iOS device still works, chances are the battery of your remote needs to be replaced. Logitech provides instructions for this.