Session Variable Lost

[eluser]baudday[/eluser]
I have a session variable called $sizes that is a two dimensional array. I set this variable in a function called "quantities." After I do this and some other things, I load a view. A form is submitted from that view and that form gets processed by a function called "ink." For some reason I am losing the session variable going from the view to the "ink" function. I did a print_r in "quantities" and in the view and the variable was still set, but once the program goes to the "ink" function, the session variable is cleared. Does anyone know why this could possibly be happening? If you need to see my code I can post it. Thanks.