I have done that in the past and it is still not checked. So that does not seem to be the problem
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If that is a windows machine, please clear the temp file under this location : C:\Users\UserName\AppData\Local\Temp
Also follow these steps.
Go To preferences -> file handling and change the cache size to at least 30 GB.
Please hit purge cache as well.
Exit Lr and re-open that
I am on a mac running 10.10.4
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