PayPal link "forgets" href|osCsid info

[Guest]

I'm doing my testing in the sandbox (though had same problem when tested with live PayPal):

 

- osC sends all good info to PayPal (sosCsid remains constant on address line thus far)

- PayPal properly processes the payment

- upon clicking ReturnToMerchant I'm sent back to login screen (even though PayPal is set to return me to checkout_process)

- order is not written to database

 

However, when I process a COD order, all is good (and the osCsid is still there at checkout_success). The significant difference: PayPal is told to return to me using this vanilla code:

 

tep_href_link(FILENAME_CHECKOUT_PROCESS, '', 'SSL')

 

which is *exactly* the same code used by COD, BUT ... PayPal seems to have forgotten the href, because I assume it's dropped the osCsid.

 

I have other probably-related issues of my login getting clobbered, even within my site. So I assume the PayPal issue is but one manifestation of a sessionid trailing problem. But I'm not sure where to focus my search.

 

Thanks for the help.

Troy