This software drives me crazy. Had some strange stuff when starting the program some days ago and decided to remove and resync chain data. It takes forever, stuck now with 150 blocks remaining... after 3 whole days of downloading. Grrrr... why so damn slow sync?
That is normal because there are many transactions happening in ETH now and it will really take a long time for it to resync and that is one of the reasons why I hate that kind of wallet when it comes to old coins. If you don't want that, use their web wallet that is more convenient to use but it is more vulnerable in phishing. It is fine though just enter your private key on the original site of mew. Transfer your funds at your myetherwallet after sync is done with your ethereum mist.