User Sync Not Working - both master and sub-site are in sub-directories

So. I just paid for and installed User-Sync and I am not getting any errors anywhere but it is not working.

Here is my setup:
I have a single domain and wp installed in 2 different subdirectories so they are http://www.domain.com/a and http://www.domain.com/b. Let's say A is the Master B is the Slave. I hooked it all up and it says "Synchronization of all Subsites completed." When I go to the slave site....no new users. If this doesn't work I would really like my $19 back please. Thanks