Thanks for your reply.
I have enough money to upload so its not due to a shortage of funds. I am using Phoenix Firestorm and logging into the main grid. I did also download the standard SL viewer and had the same problem.
When I go into SL, go to the Build tab and select upload animation I am able to select the .bvh file from where it is saved but when the box pops up the upload button is grey out and I get a message about failure to initialize motion.