CRE Loaded OSCommerce work for several sites.

I have 2 OSCommerce sites that need some minor work. One site is version 6.20 CRE Loaded, seems to be working fine, but when a user confirms an order, the screen goes blank (white screen, no error message). I need to get this fixed. I also need to add a text input field as an attirubute, so that the user can add up to 30 characters of text (as this store offers personalized items). Second site is version 6.15 CRE Loaded. This site has been operating for over 1 year, but is having problems with two contributions. First, we cannot get the cross sell feature to work, secondly, we are having problems with the coupon codes. They coupon codes work fine, until we attempt to limit the available categories for the coupons, then they stop working all together. I would prefer to work with one person for both jobs. But if you want to bid on one or the other, please specify.