There was a similar issue reported to our support about the image crop module. The widget is currently under review and we will update the module soon, this should fix your issue as well. I expect to have an update in 1 or 2 days.
We updated the widget inside the module, today we're updating the Image Crop Module in the AppStore. You can already use the new widget by downloading it from Github: https://github.com/mendix/ImageCropModule/blob/master/src_module/widgets/Cropper.mpk?raw=true
Replace the Cropper.mpk that is currently in your project with this one. It should work fine.