This is easy to explain. There are not "coins" in your wallet, there are "outputs" corresponding to transactions you have received. These outputs can only be spent in their entirety. So if you have an output of 10 that you received and you use it to send 1, then a transaction of 9 is sent back to you as change. As with any transaction, this one coming back to you takes time to confirm. Until that time the wallet reports that 9 of your balance as locked.
Very nice explanation. thank you!
Alright so my first two test transactions worked out fine. Now I tried making a much larger transaction about 30 min ago and it's shown as gone in my sending wallet but it hasn't showed up in my receiving wallet. I'm positive the address is correct since I've checked it like 5 times now. I tried looking at the transaction ID on http://monerochain.info/ but it doesn't show. However the 2 previous transactions that worked aren't showing up there either.
Really confused right now.. Any help appreciated.
Kind of getting nervous now. Sent another small transaction and that one showed up right away. So my big transaction is still in limbo. It's gone from my sending wallet and not received on my receiving wallet.