I just dowloaded the wikitude SDK for unity. I wanted to try to change the target image. So i simply imported the wikitude package, added the new image to the TargetImage folder(same format as the others). When i tried to make a new collection, using the WTC Editor, by selecting the image it did absolute nothing. Also if i tried to add the image to another collection: the image was in the collection, but by clicking on apply it didn't save the changes.