Michail/ChainSmoker: can you explain how you recovered it?
There are several places in the DB where the data is stored.
Clearing the syncing private is easy to change, but simply deleting isn't enough in case there may actually be payments waiting.
As for the sending with error, it may be trying to combine with a bad item. So, you can try changing the amount you're sending and the app may not include the bad entry.
In ChainSmoker's case, I had to adjust the DB through trial and error to figure out which entry was causing the problem. This is how I was able to move out all the GBB except for the single entry. It's unfortunate that that single entry was made up of the larger 3.47 (actually 3,478,700,000 blackbytes).
Take note that I did not charge anything. It was only for my personal learning experience. I could have made things worse. In this instance, I was not able to recover everything; however, 14GBB out of 17.4GBB wasn't terrible. It's better than having 0GBB.

ChainSmoker obviously had to trust me with his wallet.
Oh yeah, there was an added confusion when he sent me a backup that was prior to the issue and prior to him having sent out some GB causing an issue with the wallet not knowing of a change address, but that was quickly determined.
You're welcome to send me your wallet.
