Hello,
I was curious for blackcoin, everything sounded so nice and "fast" on their website... now I installed the wallet blackcoin-qt (current qt version 5.3.2 and blackcoin version v1.1.2-35-g55a46ff) and it doesn't take hours, it takes DAYS (or maybe forever?) to synchronize with the network. And it takes processor capacity, and the computer becomes hot and ventilation goes up. I have a fast internet connection, there are for example 17 connections, and never had this problem with other wallets.
What is it? If this is so lame, this currency will never be used by anyone...?
Have you tried syncing using the bootstrap?
http://www.reddit.com/r/blackcoin/comments/2ogpnz/blackcoin_bootstrapdat_up_to_block_480000/