Preview in Lion fails when any document opened has changed
A rather unsatisfactory solution might be File-&gt;Open Recent-&gt;*top of the list*

I suggest unsatisfactory because 


it launches a new window
you have to go and close the old window
the folder you are in might not be at the top of the list
it's not a keyboard shortcut
it's not automatic
it requires a lot of mousing and a couple of clicks
it makes me have to think


but i digress with this bitching and moaning, did anyone post an issue with Apple or find the proper solution?