I'm seeing the same thing. I've sent three transactions in the last few hours, each about 30 minutes apart. Only the first made it to its destination. The other two look like they've sent, but have generated zero confirmations, and their transaction IDs do not appear in the blockchain. Fortunately these were just small test transactions of 5 FLT each; I was planning to send a much larger amount, but after skimming this thread decided I to send a few tests first since so many people were reporting sync issues.