Having an issue. Was caused by Avast blocking a file after I sent some Ether to Dao. Have removed Avast now that I understand it was messing stuff up. Restarted computer... now when i try to sync it says "unhandled trie error: missing trie node" & "invalid receipt root hash" Running latest version 7.4 of Mist wallet on a mac. Seems when I sent the ether to dao, Avast blocked some part of the transaction.... now its stuck Any help would be greatly appreciated :-)
As there appears to have been some corruption, now that Avast is off, I would suggest deleting the chaindata and then running Mist again.
Mac: ~/Library/Ethereum Linux: ~/.ethereum Windows: %APPDATA%/Ethereum
chaindata subdirectory that you find.