When transferring projects between computers, even with identical audio-interface / external hardware, the windows habit of naming MIDI ports according to which USB port they have been plugged in before may require MIDI ports in use in Sonar to be updated manually.
 
While this may sound trivial, it is very cumbersome if one has to regularly transfer many projects between DAWs of identical setup and the MIDI device e.g. is called "MIDI IN" on one machine and "2- MIDI IN" on the second one.
 
It would all be so simple if Sonar would ...

1. address MIDI devices using their friendly names and
2. allow assigning a default MIDI interface to which all missing devices get assigned to (at least a setting in some ini file)

 
Here's our specific situation:
We use a playlist of Sonar projects for live shows which switch FX and digi mixer scenes ... on the main machine windows named the MIDI port "X-USB MIDI OUT" but on the backup it named it  "2- X-USB MIDI OUT" ... so when transferring the projects to the backup machine, they will not work because when used in the playlist, each project prompts for reassigning a missing MIDI device (due to the different MIDI port names despite being the same device) ... so the only way to "fix" this is opening and modifying each project on the backup (which is time consuming and error prone and a hassle) ...
 

Good point.  Probably too esoteric for the baking staff to get it, though, since they don't seem to get much of anything to do with midi ports and channels.    I've just resigned myself to changing all the darn midi ports whenever an import needs to be done.