Flow graph fails when the complexity increased (without USRP device)

Hi all,

I am using GNURADIO 3.7, Ubuntu 13.04

I want to generate dictionary elements using flow graph.

dvbt_dictionary block connects to FFT block it connects
to dvbt_dictionary2 and again after FFT block it connects
to dvbt_dictionary3.
dvbt_dictionary2.cc saves files as a dictionary elements.

The problem is that when I increase the complexity (generate more
elements) it does not work (For example when I want to generate more
than 100 elements).
I attach three .cc files and flow graph.

Can someone help me?