Anyone else seeing weirdness in WX FFT under 3.7?

I'm running a simple baseband loopback test on development hardware using 
BasicRX/BasicTX, passing CW's out and back again.
When I use my normal flow graph that's WX GUI based I see large skirts on the 
CW's and a large magnitude bounce in the noise floor that's proportional in 
frequency to the CW freq.
When I build the same functionality entirely using QT widgets all looks as it 
should do.

Master@c1f0b50d1d5a817c98130726997ba284ea980d95
Screen shot here: http://ianbuckley.net/fft_3.7.png

-Ian

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