Having similar problems when I try to buy one of my own models (the model has been uploaded with no problems).
When I try adding the model to my my cart, I get a blank page. When I try reloading, I get redirected back to the model page. Then when I try the cart I get some errors:
{nocache:21fa84481ce1f459808a241950ce5209#3} {/nocache:21fa84481ce1f459808a241950ce5209#3} [[HEAD]]
{nocache:334f2d1049fed000a4bb3c15da4318f2#0}
{/nocache:334f2d1049fed000a4bb3c15da4318f2#0}
{nocache:334f2d1049fed000a4bb3c15da4318f2#1} {/nocache:334f2d1049fed000a4bb3c15da4318f2#1}
{nocache:334f2d1049fed000a4bb3c15da4318f2#2} {/nocache:334f2d1049fed000a4bb3c15da4318f2#2}
I tried with Opera and Chrome and get the same exact problem. Please let me know if there is something that I need to do differently or if there was a resolution to the original post.
Thanks!