I had lots of problems with the wallet crashing on a windows 7 machine, I gave up today and moved the wallet to a windows 8 pc and now it fine. Its just a pain that I missed the majority of the 10% payouts.
You didn't missed , just leave it open and you will see like a jackpot
the rejected coins will come back to your wallet but you need to keep it open .If you close the wallet before the coin having 10-15 confirmations then it will be orphaned.