stuck on same block on both windows and linux
prolly you've been fed with dirty data and stuck in a fork - use kiklo's chain snapshot, and resync.
there's no reason to wait for hours, this coin is safe enough, it won't perform long rollbacks
same goes to the guy with negative calculated stake,
usually that means it's been fed with a block from the wrong chain
which has timestamp less than previous block on the right chain,
time delta becomes negative and so is the calculated stake
then check your ssd/hdd, timeoffset, connnections (should be >10 if listen=1) and coffee machine,
and of course syncing should be done in locked state,
if nothing helps - try syncing with empty wallet.dat and a pair of jamaican cigars
