I discovered that tellfriend.php has one problem. When email to friend successfully sent it must return green message box, telling "Email sent", and hopefully close the JS window.
But it only clears form, and users will think that they invite hasn't been mailed.
UPD:
I use Dolphin 6.1.1 strongly modified by me, but I tested same actions on Boonex (http://www.boonex.us), and on Aramis's (http://www.demozzz.ru) demosites, running last version of Dolphin, and get the same result.
I'm not requesting assistance, just informing Boonex team about bug.
And I hope this will be in Trac soon.
scroll to the bottom of this page and see the huge banner at the bottom with the words "found a bug? have a suggestion?"
try clicking that and sending the bug report direct to boonex as asked