When using the PicoScope Software the first time (or emulating this by deleting 'psw.ini' and 'PicoScop 3206 SETTINGS.pss') the Signal Generator will not start when Sweep-Mode is set active (also checkmark 'Repeat Signal').
The reason is the default value of 0.1 'Increment' Field. After changing this field to any value greater than 1.0 the generator will work.
Setting back the increment value back to < 1.0 the signal generator seems locked, no frequency or waveform changing is possible.
Deactivating the Sweep-Mode will also release the lock.
Best regards, Karl
BTW: Is it normal, that low frequency waveform (eg. square, 5 Hz) looks very distorted ?