Even tho I am using C7 and not Elements,
I have had this happen once on my laptop that uses 10.7.5.
Don't know if this will work for you but
in my case repairing 'Permissions' helped solve the prob.
If yer gear ain't breakin down, you aint workin' much.
iMac i7 2.8Gz 16GB 10.9...../C5.5/6.5/7.5
Mbook 2.4Gz 4GB 10.7.5.../C5.5/6.5/7.5
Mac Pro w/3 4k monitors.
On-line in Jan 2015
On the side of a volcano in the middle of the Pacific Ocean.