Hi CNCtronic,
Very strange.
If Tera Term with serial Port works then that indicates KFLOP is working correctly and the problem must be on the PC. KFLOP doesn't know if command strings are sent via the PC Serial Port Driver or the DLL Driver.
But you said you re-installed the drivers. Maybe you didn't do it correctly or you didn't remove the other drivers?
What shows up in Device Manager?
What OS are you using?
Odd that you were able to do Recovery if KMotion doesn't connect.
Regards