I don't understand the supposed bug enough to know if it harm me or not.
All can I say is since March 10th I receive about a number really close to 1% of interest per day for staking.
The wallet connects sync fast and run it since 11 days with no problem.
So where's the bug?
Short version:
If you have more than 253 SMAC in one stake (also happens with less SMAC if the coinage is > min coinage required for staking) you hit a buffer overflow in PoS reward calculation which results in a way too low reward. Since nStakeCombineThreshold is set to 1000, splitting coins into smaller transactions when sending them to your wallet doesn't help - those transactions would be added up when creating stakes due to that threshold.