I'd like to start by congratulating you on such a great plugin - it's been extremely valuable to me on my latest project.
I have found a strange issue though. Sometimes when I go to do a manual crop, the crop area is not the right size/proportions. For instance, one of my crops is 240x160 (hard crop) but the manual crop selection is not correct - it is too wide in relation to height. Please see this screen grab.
You can see that the 'Previous image' (the one that's automatically created from the crop dimensions) is correct, but the crop selection box and the 'New image' are wrong!
This doesn't always happen for this crop size - just with certain images. I havent been able to work out the relationship between the ones that get the wrong sized crop selection but maybe it's to do with the original images dimensions?