Hello Taek! I and my friend found interesting bug 

I download wallet version 0.3.0 from internet and launch file  sia.exe without extract arhive.
After this procedure my friend send me 3000 sia coins and after network found new block, i can see this coin in my balans.
But i close program and launch sia.exe after 6 hours- i see that my coins we be lost. I think- process SIA.exe can*t write information about new adress in file wallet.dat, if I launch sia.exe from rar arhive.

Need blocked  opportunity to launch sia.exe without  extract rar arhive