I would like to report an issue with all versions from RC8 2.1, 2.1, and 2.1.1.
After few hours of having the client running I have a wrong balance displayed in the overview window it jumps up in the order of millions of NBT.
This issue does not affect the actual balance and if you try to send more than what you have available in the wallet you will get a window message saying that you do not have enough funds for the transfer.
