Here's a tip, make sure you are using a very strong rpc password. I held around 4,500 vtc, then yesterday someone cracked my rpc password, and stole 3,000 vtc. Monitoring the blockchain I have noticed this has happened to multiple wallets. So don't let this happen to you too!
Ouch, sorry!
How did that happen to you? I thought "rpcallowip=127.0.0.1" was the default? Also, how could you possibly detect the other instances just from looking at the blockchain?