The good news is that in most cases, the winnings are still added to your account, even though the game froze and you had to reload, unless the problem occurred for a Level-Up bonus or a Bonus Game.
This problem may be related to sharing, so you can try unchecking the checkbox next time you get that type of win or bonus to see if that helps. You may also want to try changing how the sharing works in your game using our customization menu. You can open that menu by clicking on your photo in the upper left corner of the game.
In any case, you should be able to avoid this problem by not clicking the "X" button on the Facebook share page -- please only use the "Cancel" or "Done" buttons on that pop-up.
However, Facebook has reported to us that they have put in a fix for this issue, so if you are still seeing it, you may also want to try clearing your cache. Here's how:
If you're using Chrome: http://support.google.com/chrome/bin/answer.py?hl=en&answer=95582
If you're using Internet Explorer: http://support.microsoft.com/kb/260897
If you're using Firefox: http://support.mozilla.org/en-US/kb/clear-cache-delete-temporary-fi...