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Problem solved. Even though RUMlog put an "S" in the lotw columns, the contacts weren't actually sent to LOTW. I finally figured out the proper setting for uploading and then downloading work fine.

I loaded RUMlog on my mac on July 3. Since then, I have uploaded many contacts to LOTW. The log shows “S” in the LOTW column. But I’m sure many of these are confirmed - especially the W1AW portable stations. I do not get any error messages when selecting LOTW IN. But none of the “S” have changed to ...