The bootstrap.dat file is only needed if you are re-syncing. It will help speed up the block import process. If your wallet is already in sync and showing the green tick then you will not need it.
Next step is check your wallet is showing the same block height as the block explorer (currently 643277)

Now restart your wallet using the -rescan switch to see if it can recover missing transactions in your wallet. e.g.

Windows:
1) Using the command window, navigate to the folder where the executable is located
2) Run the following command...

Mac:
1) Using Terminal, navigate to the folder where the boostcoin app is located
2) Now navigate to this folder inside the .app where the boostcoin-core-qt-v4.4.1.2 binary is located
3) Run the binary using this command with the -rescan switch