What OS are you using? and provide me the getinfo.
Windows 8 64 bit.
{
"version" : "v5.4.1.0",
"protocolversion" : 70100,
"walletversion" : 60000,
"balance" : 1052.80051300,
"newmint" : 0.00000000,
"stake" : 8.91301200,
"blocks" : 50769,
"moneysupply" : 513007.89436200,
"connections" : 9,
"proxy" : "",
"ip" : "2qe6mczkgrqkaaxl.onion",
"difficulty" : 590.79401643,
"testnet" : false,
"keypoololdest" : 1408501802,
"keypoolsize" : 101,
"paytxfee" : 0.00000000,
"errors" : ""
}
Whats your address? When you go to the block explorer you still see there your "old" balance?
Looks like the coins never left your wallet, so you can try 2 things:
1. Start the wallet with the -rescan command
2. Close the Wallet, delete all files in the folder %appdata%\arcoin
except the wallet.dat (Make a backup of it just in case) and start the wallet again.