Here are the two URLs for preview:
http://*****/product.php?cPath=14_1&...preview&page=1 (gives me error 400)
http://*****/product.php?cPath=14_1&...preview&page=1 (gives me no error)

They are identical, but one works and one doesnt, they are both in the same category. The only difference I see is one had a model number and the other doesnt.

Here are the two EDIT urls and nice call:

***/product.php?cPath=14_1&product_type=1&pID=33&action=new_product
***/product.php?page=1&product_type=1&cPath=14_1&pID=1&action=new_product

The bad boy has added some extra characters. How why what and when?