You can ignore this post. Today I successfully upload 30 photos to new and old galleries without any problems. The only difference is that I uploaded without any changes. Perhaps my old profiles caused the problem. In any event all is good now.
Over the last week I've been uploading photos to my Smugmug account. In the most recent situation I had 3 batches of 30 each photos. My settings are to reduce long side to 2000 and keep metadata. In every case I couldn't upload all of the 30 photos in each batch. Some ended up with only 8, one 14, and one 25. In one attempt to figure out what was going on I deleted all of the gallery's 8 photos and then tried again but that time only 16 were successful.
Usually I can upload without any problems so I don't know why this time is different. The only significant thing I've done with the 90 photos was more processing in ON1 PhotoRaw. I can't imagine that being a problem, but what do I know.
Anyone have any thoughts why I'd suddenly have such problems? I have contacted Smugmug but haven't heard back yet.