*edit: maybe your problem is that you sent the transaction before it synced and you had a displayed balance with more funds in it than you really have... because seems you are trying to send 12.5 when you already had sent 3 and your total incoming transactions are 12.5ltc... and seems there is another outgoing transaction under the purple rectangle border
Well I had 12.50234914 LTC and I tried to send them to cryptsy while the wallet wasn't sync. After a while I restarted the wallet and I had a new balance which was 3.88744905. I sent this to cryptsy and that worked, because the wallet was sync.
And now there is another transaction with an amount of -6.25 showed up. Same date and time as the 12.50234914 LTC transaction.
Anyways: I had 12.50234914 LTC and 3.88744905 of were sent successfully. So, how do I get back the 8.61490009 LTC. I tried to dump my private key (is this the same as my private password?)
Hmmm...
23:11:15 - dumpprivkey LVtp3K9dHbS6Zpq1S1LjbRZyKSVhtRJsSa
23:11:15 - Private key for address LVtp3K9dHbS6Zpq1S1LjbRZyKSVhtRJsSa is not known (code -4)