2014-Jun-27 00:11:57.571893 [P2P8][220.162.134.106:18080 OUT]Sync data returned unknown top block: 94300 -> 103046 [8746 blocks (6 days) behind]
From practical point of view, I have not lost no XMR coins. Sometimes, bitmonerod writes messages even weirder than this. Sometimes it seems to stop accepting new blocks. I just restart it. And all seems ok.
All we waiting for new fixes form Monero devs! But I say - I CAN work with Monero even with these issues. No one case I caught that data was damaged or my transaction was lost. Large transactions do not pass sometimes, I divide them in half-parts simply.