After upgrading from a previous version of Logic, ReWire no longer seems to work. ReWire client applications do not sync to Logic Pro X.
Logic Pro X has a new option "Off" in the ReWire Behavior menu in Logic's Preferences panel. This is the default setting in Logic Pro X. To change the setting:
Choose Logic Pro > Preferences > Audio.
Click the ReWire Behavior drop-down menu.
Choose either "Playback Mode (Less CPU Load)" if you are only routing audio from a ReWire client while syncing the transports, or "Live Mode (ReWire and Internal) if you plan to trigger instrument plug-ins in the ReWire client from Logic.
Quit and then reopen Logic Pro X.
Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability. Contact the vendor for additional information.