finally, by the way of the official download but not P2P, I find this problem has been solved. software works well.

just  kill these two process and restart again.

Also I download a tar.gz package for Linux 32bit, it cannot be opened with winrar. It reports the tar.gz is a bad package.

Must I download from the dorpbox source?my download software get some data from other mirror(may be P2P)

By the way,  my operating system is  Ubuntu 14.04 i386