After mmcpool down, memorycoin was forked.
Dev's seed-nodes on different forks.
I have tried many times to redownload blockchain, and it stops always on block 56208
SetBestChain: new best=0001e1911f1286da4f6ee2653b9ee5cdfb31669b3159d6dd56e435381e1f0449 height=56207 log2_work=32.775888 tx=288456 date=2014-08-08 10:18:42 unixtime=1407493122 progress=0.996187
Committing 1 changed transactions to coin database...
SetBestChain: new best=000115a785bd7987167d425cb00babeb143866647f2927959a060ec65f915bbd height=56208 log2_work=32.775892 tx=288457 date=2014-08-08 10:20:30 unixtime=1407493230 progress=0.996194
ERROR: AcceptBlock() : incorrect proof of work
ProcessBlock: ACCEPTED
ResendWalletTransactions()
received block 0000f8a46609f319027e525affd46cc2d721e42b0a058c9ce55765d58657f7b3
ProcessBlock: ORPHAN BLOCK, prev=0001d1d2deb63ec742cc30b78b63028b191abdea6e5b2e9e1a26d8acdac3cecf
received block 00022bc25c1ee5c084647ac5858c1d5e8ebcc30020dca8c1f035225c9e01275b
ProcessBlock: ORPHAN BLOCK, prev=0000f8a46609f319027e525affd46cc2d721e42b0a058c9ce55765d58657f7b3
received block 00011056c769d274d77a578938420d4c3aeb4458aa70195beacdd17e823ddc6f
ProcessBlock: ORPHAN BLOCK, prev=00022bc25c1ee5c084647ac5858c1d5e8ebcc30020dca8c1f035225c9e01275b
received block 00022418456b1b1fa28f53935136285f6e97ac06461c0d2456c20fa74eded4b1