I don't understand how blocks can be accepted, immature coins show in wallet, then disappear a few seconds later? Does anybody feel like taking a bit of time to explain how this happens? Thank ya kindly.
The time it takes for the new blocks to propagate is more than the time it takes to find a block in a fresh blockchain with everyone trying to sync.
So, sometimes you find a block but it's too late, and you get orphaned. These don't usually show up in your wallet but sometimes...
when the clock chain is fresh,a nd propgating slowly across the p2p network you and/or a couple of your peers are sorking on a chain, when you come across a longer block chain on the network.
Faced with this, the client takes the longer blockchain as the "master" and changes to it. So you lose any coins you had mined in the orphan chain during the reorg in most cases, since you weren't mining on the longer chain.