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There are a couple of things you should try: Enable the 'Always Run In Real-Time' function on the plug-in (see video below - requires Quicktime)https://www.tcelectronic.com/files/Support/videos/FAQ2333/Always.mov

Force DP to rescan AU plugins: Trash the 'audio unit info cache' in 'library>preferences>digital performer' (see video below - requires Quicktime) https://www.tcelectronic.com/files/Support/videos/FAQ2333/Trash.mov Then reopen DP