Welcome back everyone. Bitcointalk being down was unfortunate, but it allowed us to get more work done so we will have the enhanced mac wallet today and a sneak peek of what the arbitrage bot will look like.
For now, we have to deal with this issue with the checkpointing server. The other day when the block explorer halted, that's when we noticed an attack on the main node which put server resources (memory, swap, and cpu) at 100% so we had to restart it. This caused a fork, but we fixed it within 30 minutes. Some of you may be on the same fork as the attack, which is easy to fix.
Check http://explorer.graphcoin.co/ and make sure your wallet is on the same block as this, if not, you will need to back up your wallet.dat in the %appdata% directory and then delete everything except your wallet.dat and resync.
The main checkpointing server is built into the wallet, but if you want to be extra careful, you can put: