We are suddenly having this exact problem (for the last 5 months after 3 years of successful orders). There have been no significant to changes to our site or servers in that time.
Different from above is that we are using PayFlow Pro Gateway (Paypal is not an option for the company).
There is no difference in the cached logs for the successful and unsuccessful orders. (by unsuccessful I mean: payment processed, log made, order in Orders table, no products and no email.)
Time elapsed as show by log is not longer for unsuccessful orders. (example: DoDirectPayment, Elapsed: 656ms -- Succeeded)
Suggestions of where I should look next for clues???
Much appreciated!
christa


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