Hello there,
I have two websites such as,
www.domain.com
sub.domain.com
I am not using the multisites component so i made views on sub.domain.com site which retrieves __user* and __session tables from 
www.domain.com
I did also replace the secret key with 
www.domain.com on sub.domain.com
I have installed and enabled the plugin on both sites.
| Code: | 
| 
 SSI active for the - BothAction - selected domains
 Domains - none
 Free additional domain - www.domain.com
 sub.domain.com
 
 Ping protocol - Current site
 
 | 
These are the settings on both sites, im sure adding the same domains in both places would not matter as self pinging is ignored.
I tried the troubleshoot method and both sites return true.
Unfortunately i am not logged into one site if i log into the other. Sometimes it would not simply let me log in at all and returns "session expired "
would appreciate some help/advice