Uh, i see.. this must be a regression as i fixed that bug some time ago. Let me check in this days and i'll wirte you back. Would you please open an issue on github?
Okay. There is a preview checkbox in the export tab on the right panel. I did check it, and use the "export to" button, that worked perfectly. The preview image is properly cropped. Also note, that I used the icon up top that looks like a video player with a white button. That is the one that does not crop the image properly