This applies for Windows users: Make some simple edits to your project and then save it. If the BBM File - Sync Project to SD card menu item is not grayed out, let it sync and you should be good to go. If it is grayed out, use the Export Project to SD card and accept the prompt for future syncs.
For Mac users, the BBM the Sync Project to SD card is buggy and you will have to use the Export process to update your project on your SD card. There are a couple of workarounds: