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I sent two transactions to the same place. I think they both show in blockchain, but they aren't at the intended address. After 48 hours, I got concerned and changed from Electrum to Bitcoin-Qt, sending my remaining coins to Bitcoin-Qt. That doesn't show in the blockchain as far as I can see. I included the default transaction fee each time.
After about a week, I'm still in the same state. I'll add transaction ID's when I get back to my mac. More info to follow. I checked answers to other questions but couldn't find a resolve or anything that seemed to fit my attempted exchanges.