It appears that your transaction was not broadcast yet for some reason.
Can you provide the transaction ID?
What version of Bitcoin Core are you using?
Do you know for certain if your wallet was fully synchronized before you sent the transaction?
55a7c966561eba10c7d0128fb73f0cac6604c9cce5058a77cb0a8fbe4188ba69-000
v0.9.1.0-g026a939-beta (64-bit)
it wasn't fully synchronized at the time of sending [about 20 hours behind]
but I waited until it sychronized, still nothing
I believe I recall occasionally having issues with version 0.9.1 failing to broadcast a transaction if it was sent before the wallet had finished synchronizing.
You can either wait for the wallet to eventually re-broadcast the transaction on its own (I have no idea how long that is likely to take), or you can push the transaction on your own.
If you decide to push it on your own, you can do so as follows:
In the "Debug Window" under the "Help" menu, choose "Console".
In the console, enter the following command:
getrawtransaction 55a7c966561eba10c7d0128fb73f0cac6604c9cce5058a77cb0a8fbe4188ba69
You should receive a response in the console window of a long string of alphanumeric characters (the hex representation of the raw transaction that you are attempting to broadcast).
Copy the raw transaction to your clipboard.
Load up the blockchain.info "Broadcast Transaction"
web page in your favorite web browser:
https://blockchain.info/pushtxPaste your raw transaction from your clipboard into the text box on the web page.
Click the "Submit Transaction" button on the web page to send your transaction to the bitcoin network.
