[Discuss-gnuradio] Arbitrary resampler question on gnuradio 3.7.2.1

[George]

Hello all, 

Considering a simple gnuradio flowgraph as the following

Random source -> chunks2symbols -> complex2float -> float2complex -> 
pfb_arb_resampler-> USRP sink

which used to work without any problem in the older gnuradio distributions, in 
the newer 3.7.2.1 seems that the conversion above (from complex to float and 
float to complex) introduces a problem, that has to do with USRP transmissions. 

However, when I increased the number of taps used for the root raised cosine 
filter in pfb_arb_resampler by a factor of 100, everything seems to work 
properly.

Note that if the conversions float2complex and complex2float miss everything 
works.

Any ideas why? 

Thanks,
-George