Tomasz,
I was having problems too. It appeared that even though I received “cropped successful” message, when I closed the popup window after making my crop (using the “x” in upper right to close), the image crop did not change. However, I then tried clicking “ESC” after making my crops successfully, then all of them where saved. I have a screen shot of the popup window, which I can show you that there is no “save button” only the X. I’m using Mac Firefox, and keep it updated. Now that I know how to work it, this is seriously my favorite plugin of all time. Point me to a Paypal donate button and I’ll be happy to click it.