Your shortcode has some errors with the quotes:
[hilite pre_code]
[[s2Member-PayPal-Button level="1" ccaps="" desc="YOUR BUSINESS ACCOUNT / description and pricing details here." ps="paypal" lc="" cc="USD" dg="0" ns="1" custom="www.smi-10k.com| ta="0" tp="1" tt="D" ra="1.50" rp="1" rt="M" rr="1" rrt="" rra="1" image=http://www.smi-10k.com/wp-content/uploads/2013/08/d1-1-730x1024.png output="button" /]]
[/hilite]
I fixed those for you:
[hilite pre_code]
[[s2Member-PayPal-Button level="1" ccaps="" desc="YOUR BUSINESS ACCOUNT / description and pricing details here." ps="paypal" lc="" cc="USD" dg="0" ns="1" custom="www.smi-10k.com" ta="0" tp="1" tt="D" ra="1.50" rp="1" rt="M" rr="1" rrt="" rra="1" image="http://www.smi-10k.com/wp-content/uploads/2013/08/d1-1-730x1024.png" output="button" /]]
[/hilite]
See if that solves the issue. If not, please complete the troubleshooting actions suggested here: Knowledge Base » Common Troubleshooting Tips