I've just reinstalled Lion after having replaced the stock HDD with an OCZ Vertex 4 SSD and everything is fine apart from the Finder, which does not expand folders anymore..see the following screenshot, it happens only when you are in that view mode and click on the arrow before the folder name:
In the image above, the folders should be expanded but they aren't... if I change the view mode and return back in this view mode, they are expanded:
Then, if I try to close the folders, see what happens:
Can it be a problem of the last OSX 10.7.4 update?! Does it happen to any of you? Any idea about how I could resolve this problem?