Wallet crashes to whitescreen when taking sha256 of File larger than 295MB

[ChristianOConnor]

The title explains it pretty well. I've notices that whenever I try to notarize a file that is large enough (it seems that the threshold is about 295MB), the wallet screen goes completely white and becomes unresponsive.

Anyway, sorry to point this out just figured the devs might want to know about it for the next update.

On a side note I love the project! Not enough crypto projects address the imminent threat of quantum computing so I love seeing open source projects like this one that take the initiative. Great coin and great system!