Simon hangs (not responding)

Simon hanging up on Yosemite

Hi! I was testing Simon 4.0.3 on Yosemite 10.10.3 but it keeps not responding...
First, whenever I added a new test, it hanged (I had to force quit Simon and restart);
Now I cant ever access anything in Simon (I selected "preview" option on one of the tests and now when I start Simon, it just hangs, spinning wheel, have to force quit).
Do you know what can be causing this? I got a mail with a promotional price on Simon (50% off) and I was really keen on buying it.

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