Problems with Genetic Build

I am trying to create a build with Genetic evolution I am using GBPJPY, with 100 evolutions and 500 population. If I use  2 islands or less it works fine but if I use more than two islands it says generating population island 1, Generating Population Island 0, generate population Island 2 and it freezes, the progress line under the build tag continues moving but the tool does not do anything else. Whan I uses two or less everything works fine.