Intersectbed Provides An Empty Output

Hi,

I've downloaded the recent Cygwin version 1.7.24 and an trying to run bedTools but I get an empty file as my output. When I run the same commandline and files on a colleagues computer also through Cygwin I get a file containing the overlaps I seek. is the new Cygwin not compatable with BedTools? I've put the command line we used below:

./intersectbed -a Gene_body.bed -b EdgeR1.bed -wao > yyy.temp

Any help would be appreciated.