I want to attach an image to some geometry (in this case a circle).
What I do is this: I copy the desired image to the level's directory, click on the "update level resources" button and then edit the circle's image property specifying the image id. After I press enter the text field I just edited turns white again, the whole level view becomes white and everything is sort of broken. In the console window I have these warnings:

Warning: invalid image reference: "(u'LEVEL_IMAGE_WHEEL3',)"
Traceback (most recent call last):
File "metaelementui.pyc", line 280, in setModelData
File "metaworld.pyc", line 1798, in set
File "louie\dispatcher.pyc", line 352, in send
File "louie\robustapply.pyc", line 56, in robust_apply
File "levelview.pyc", line 1144, in __on_element_updated
File "levelview.pyc", line 1170, in refreshFromModel
File "levelview.pyc", line 1225, in _addElements
File "levelview.pyc", line 1217, in _addElements
File "levelview.pyc", line 1416, in _sceneCircleBuilder
File "levelview.pyc", line 1356, in _applyPixmapTransform
File "levelview.pyc", line 1368, in _applyTransform
TypeError: bad operand type for unary -: 'NoneType'

If I have another level opened in the editor and I switch to this level (to copy some geometry properties for example) I cannot switch back then to my level anymore. My level view window is still there. But when I click on it I can't access the level's properties anymore (in the side bar: Scene/Level/Resources). It still shows the properties of the other level.
For example I have my level, called "whatever", and in parallel I have opened "ThirdWheel" to copy properties from there. I want to add a circle to my level that looks the same as the "wheel3" from "ThirdWheel". So I add a circle to my level, I copy the wheel3 image to my level directory, update level resources, edit my circle's "image" property, get these error messages, my level view turns white. I then switch to the "ThirdWheel" level to copy the other properties I need for my circle and then I cannot switch back to my level anymore. It still shows the level properties of "ThirdWheel" in the sidebar and not those of my own level. Even if I close "ThirdWheel" then and have only my own level "whatever" opened then there are still the "ThirdWheel" level properties in the side bar and I can't edit my own level anymore.

I have done this several times with different images and so on. It's always the same. This sucks. How in the world has anybody ever been able to make a level with wogeditor? Please tell me.