User Activity

I'm using .ca and .com but the .ca site is becoming so slow that I can't list anymore. I also get a Authenticity Certificate popping up and can't get rid of it, other than restarting my p.c. Anybody else having this problem or know what could be caus...
I have buyer who wants to keep item and full refund because I sent item to wrong address. Her address is different on the 2 sites. I sent to Ebay address. Or she wants me to send duplicate items to the Paypal address. What do I do? Either way I would...