I was have the same problem, followed all the advise and , for me, along with the user name being in lower case, I also had to use lower case for network address. "hda". Did alot of google searching on this too. You can modify and test different scenarios using windows 7 credential manager from control panel
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also we have a new page for shares troubleshooting where this information is very useful. If you could take a minute to add these tips there, it'd be great (we're trying to encourage more community participation in the documentation).
My HDA: Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz on MSI board, 8GB RAM, 1TBx2+3TBx1