I meant by selecting an image point or origin in this list:
<img src="http://www.scirra.com/images/articles/imagepointsdlg2.png" border="0" />
Right-clicking it and then selecting Quick-Assign. Doing it with the numpad doesn't seem to do anything at all, even though this method works with normal objects. (Manually clicking does work).
I have the same OS, Windows 7 Pro 64bits.
This is the crash window:
<img src="http://i.imgur.com/0xELJ.png" border="0" />
<img src="http://i.imgur.com/e6BmC.png" border="0" />