Mapping COM ports must be based on hardware ID.
Create troubleshooting section using table with 3 columns: Problem, Cause (multiple), Fix (multiple).
Problem = Micromanager freezes or crashes.
Cause = Windows 7 Prolific version incorrectly installed
Fix = Prolific driver from ompldr
Problem = Cannot open COM 201, etc
Cause = USB bus inspection
Cause = USB power
Fix = USB 3.0 daughter card