Fulfillment Workbench Allocation error - Currency does not have a Credit Card Processor assigned

When we try to allocate ALL 2000 orders in Fulfillment Workbench with “release for picking” selected in the allocation process form, we get a “Currency does not have a Credit Card Processor assigned” error after a few minutes. Credit Card Configuration has a credit card processor set up, and Currency Master has a the processor available.

If I do one or several orders at at a time, the allocation process works.

This is in 10.2.300.6, and worked in our 10.2.200 test environment and 10.0.700.4 with these exact settings…

Any ideas on how to track down which order / line is doing this? Thanks!