Do you know what version you are using? There was a fix related to this in release 1.1.2
If you are using 1.0.10 or later you can update from within the application under "Help"->"Check for Updates". Otherwise you need to download the newest version here: http://www.kevinlangdon.com/serviceCapture
If upgrading does not fix your problem I am more than happy to take a closer look at this. Is the amf gateway returning the large result one that is Internet accessable? Would you be willing to email it to me?