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When I set the screen to Large (thanks to that excellent toolbox64), and use RealVNC, I find that FLDIGI sometimes freezes the SBITX waterfall display, particularly when changing modes.

I've tried turning down the waterfall speed with the latest DREXJJ version.

I wonder if there's any conflict between RealVNC and the audio drivers on PI. ....shouldn't but I don't know.

I thought it might by my 4GB Pi, so I swapped it for a 8GB Pi, but same thing,

Has anyone else experienced this?

The FLdigi audio settings look correct...

I think I answered my own question -- it depends on mode, some of the decoders are really slow, I switched to slow waterfall on FLDIGI, found my frequency and then turned it off.
Modes like Olivia, no problems. PSK31, sometimes problems. Never have a problem with WSJTX...hmn