Iphone app.

Hello everyone.
I managed to get the iphone app using "iphone.redhotpawn.com", but I've got a problem.
When it's my turn to move. I can click on the piece that I want to move.... but when I click on the destination square it doesnt' work.
The first square gets green but the destination square doesn't. It just appear the name of the square ... so I can't move at all.
I will appreciate any help.
Thanks, ;-)