I followed your recommendation and this is the same message from linkpointcentral:
"Form Processing Error
The following errors occurred while processing your request:
# Charge amount doesn't equal the sum of the subtotal, shipping and taxes."
Do you think that it makes any difference what order the hidden fields are in and/or do I need to make any changes in the ecart object? Again, I have removed the code so it will work again with only the "chargetotal" remaining.
What else can I give you that may help?