I have the same problem but it's almost a week! Huh isn't that to much?
I am using as well Multibit HD 0.5.1 and the transaction id is the following:
dde0cd3667d0d8a045793b52636777edf3e0c551a5dd48260afdf2315527c430
I successfully submitted it to the viabtc accelerator. It will now confirm when viabtc mines its next block if no other pool confirms it first. You can find a list of the times viabtc mined its most recent blocks here. It gives an idea of how long you might have to wait.
https://blockchain.info/blocks/ViaBTC