The issue is not reproducible in the current version of Telerik UI for ASP.NET AJAX
Setting the property Canvasmode="No" solves not the problem. If getEditableImage().get_height() or getEditableImage().get_width() returns 0, the ZoomBestFit() method the image (original size 1400x880 pixel) is displayed in a size like a thumbnail (80x60 p