Aha, good idea. The JDBC driver is the same as was used on the old server (ojdbc14.jar), however it is for 10g. The Oracle site shows a different driver (ojdbc6.jar) for 11g. I'll try swapping it out and see what happens.
As for the connector config, it is here:
As for errors, there are no errors in either MII or Oracle. That is the strangest part (and the most frustrating. Since it isn't repeatable I can't catch in in the BLS running manually in trace mode.
Thanks for the help.