Smart FTP - Keeps Crashing

Hi

I downloaded this program having been recommended to me. Its version 2.5 and Im using it on Win XP, 3.ghz athlon cpu, 1gb ram

Problem is that it keeps crashing. It runs for a couple of minutes and then just freezes up stating "Not Responding"

Is this a known fault or has anyone any idea as to what is going wrong?

Thanks