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Thanks for all the responses. You mean there's a battery in the Micro Express?

Weird problem. Every time I restart my Mac, the MIDI setup window shows a new active MIDI Express device with my other devices not connected and I have to manually reconnect them all to the new MIDI Express device in order to work in DP. Does anybody know about this problem?

Thanks for this excellent advice!

I am moving all my music production including DP to a new Mac. Do I need to reinstall all plug ins? Or can I merely copy them from the library of the old machine to the library of the new machine.

Many thanks!