Up until recently, the Image Upload widget from Model Concept wasn't exactly working as designed. We described in detail a process for fixing the widget, however it was not particularly easy. The developer responsible for the widget, Tom Stoelwinder, contacted me to say that he had fixed the widget and officially released version 1.1.1.
If you were interested in the functionality of the Image Upload widget and considered the process to modify it too daunting, you can now grab the updated version here which features the fix we covered. Thanks, Tom!