ofxFFT problem with the Inverse FFT

Continuing the discussion from ofxFft: FFTW + KISS FFT wrapper:

Hello Joseph,
im in trouble with the inverse FFT, i have a series of clics, and i don´t know whats going on, do you resolve this problem ?

The glitch applies to the function setPolar, when applying a filter (i´m applying a flat low pass filter).
The graph below show before and after the setPolar (both are the inverse FFT outputs):


Researching im realize that problem is a classical Frequency-domain filtering issue: