Why does Reason sometimes lose it's MIDI connection when I switch to another...

Why does Reason sometimes lose it's MIDI connection when I switch to another MIDI application?

* It has turned out that Reason can lose contact with OMS if OMS is not set to run in the background. To fix it, do this:
1. Close Reason
2. Open the OMS setup application
3. In Edit -> OMS MIDI setup, enable the 'Run MIDI in background' option.
4. Save and quit OMS setup
5. Launch Reason again.

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