Matthew Magnifico

i have been using the catznip viewer and have had no issues untill today. i can send Ims to frineds but when they reply to me, it comes up that im off line, i get there messsages as offline messages, also when i try to buy things, it comes up with faild to buy, even tho i have more than enough lindens, i double checked on the linden dashboard and even that says i have enough lindens. can anyone help me please