Hi Keith,

I managed to get the waterfall to freeze but only by disconnecting the USB 
cable (Audio) from the SignaLink box which wasn’t turned on anyway.   WSJT-X 
configuration still reported USB Audio Codec as did Sytem Preferences > Sound.  
The USB cable was free - unterminated.

WIth the USB cable terminated in the SignaLink box (not switched on) but no 
audio from the rig (audio cable to the rig disconnected) the waterfall 
continues to drop.   So the waterfall does not depend on audio input.  

What seems to freeze the display are unexpected problems on USB such as a 
disconnection when live.

Can there be some problem with the USB on your Mac?

— John G4KLA
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