Maybe because I been busy, Or I have not had the issue my self, Or been able to reproduce it (I remapp network devices to same letter sometimes and I never seen any issue with it)
MC depends on Windows to notify MC about when new device are added, remove and such. And if for some reason Windows do not tell MC that a new device is available MC has not way of know it.
When MC gets the notification from Windows it is logged to the AppLog , So If you look in the AppLog (Ctrl+L) you can see if MC gets those event from Windows.
(Unless you turned it off)
In the device dropdown list at the bottom is a RefreshDevices option, select this and it will go through all device letters and add / remove them if missing.