Crashes for me too: Windows 8 Pro 64-bit.
I reproduced it by following Paradox's video almost exactly:
1) In either a new or existing project, duplicate an object (text, sprites, anything) in the layout view.
2) Click on the object's name in the projects pane OR select multiple instances of the same object in the layout view.
3) With the objects selected, click on the left side of an empty part of the properties pane and then click on the right side OR click on the right then left side.
This has actually been something that I've suffered with a long time, and I feel a little relieved that I now know what the cause is. Figured it was just "one of those things" so I save compulsively to avoid losing work (it's happened too many times). Used to do this when I had Windows 7, too.
Same here but for me but it's enough to select two or more instances/objects and clicking on the pane below the properties. Tried with both 122 and 123.2 but crashed the same. I have Windows 7 64-bit.