@stupendelious When a new wallet forks, it means the behavior from previous versions changes. You can have soft work where older versions of the wallet still work at the blocktarget (and the 1.2.4 wallet is a soft fork - you should update, but it's not the end of the world if you don't), or hard forks, where older wallets stop working at the designated block (If 1.2.4 was a hard fork, after the targeted block you wallet wouldn't work at all). But you can also have blockchain forks where nodes/pool disagree about what happened. When this happens, the nodes/pools are working towards different targets. Over the next couple of blocks the nodes/pools will agree that whichever chain has the most followers is correct - with the power ninja had it is was pretty much pre-determined that whatever it believed to be the truth would be forced to on everybody else. Often to everyone else's detriment .....