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Stimulus&Probe works only once

Category: Software
Product Number: ADAU1701
Software Version: SigmaStudio 4.7

Hello all,

I'm using Stimulus&Probe to check the frequency response on ADAU1701, it works correctly when i click Probe button at the first time.

but after closed the response window and click probe button again, nothing displayed. 

if i reopen the project and try again, it also works just once. 

I build the project the insturction Probe and Stimulus Blocks [Analog Devices Wiki],

i have no idea about the reason. attached is the

 Appreciate for the help.Thanks.