Previously, I linked a "tutorial video" in a reply. That video claims to teach the usage of the official wallet. DO NOT FOLLOW THAT VIDEO.
The steps in that video are incorrect and can cause your XRB to be stolen. That video does not tell you to backup your original seed first before updating the data file used for synchronization. So if you are a firstimer and follow that video, you will be sharing the same wallet/account with someone. And that "someone" can steal your XRB.
I lost 1,698 XRB today because of that video. And I guess that was also the cause of my number of captcha claims increased abnormally because I probably shared the same wallet/account with "someone".
Sorry to hear that happened to you, thank you for making everyone aware for the future. With the recent git commits to improve sync this hopefully you won't need the special hacks to speed up syncing.
I've just built a Mac OSX binary of the latests master for the wallet if anyone wants to try it - get in touch