Since the update 0.9.20 till now (0.9.23) I have the same problems.
Using Win10 64 bit pro, Marlin Laser (DexArm from Rotrics).
With 0.9.19 all worked fine.
Now Laser is ready mesaage but “Waiting for connection”.
115.200 baud is enabled. Nothing changed in my preferences.
Plz fix it.