Please provide us with the following information:
a) Do you have the problem with every SWF file or just one specific file?
b) What is your operating system?
c) Which version of Sothink SWF Decompiler are you using?
d) Have you got an error message? Some screenshots or a copy of the error report will be much appreciated.

Your detailed information will help us to make a further check about the problem and improve the software as well. Thanks!