Hey guys, I had the same problem as most of you, I couldn't sync since the 27th and recently couldn't sync past block 428419. I understand the frustration, and the feeling of not being able to move your money. But I don't see this as a reason to panic(or frustration) sell (to the 1 or 2 of you who mentioned it).
Supercoin is young, and these sort of hiccups will happen occasionally. I actually gained re-issuance over the last 3 days knowing that incorrect transfers can be repaired, and as long as you keep wallet.dat everything will be alright. Despite multiple reinstalls and test transfers I have not lost a single coin, and I will still eventually make back my coins I could have staked over the last 3 days. Really I just want my wallet synced so I can send my recently purchased Super from Mintpal to my wallet and begin raking in my staked coins again!
Downloading new blockchain now, I believe this should work, and I hope I'll be up and running like regular again and we can put this hiccup behind us and continue business as usual