When I open the Serial Monitor with an R4 Minima on COM7 the com port changes and the Serial Monitor can not connect. The ports are now 1-3 USB DFU.
I can upload to it.
I can open the Serial Monitor with other boards on other ports.
I can open the Serial Monitor with IDE v1 with the R4 and COM7.
I tried uninstalling Version 2 and reinstalling but that made no difference.
Solved: I uninstalled and deleted the Users app data local etc. Then reinstalled.