Lightroom CC won't open on iMac

I downloaded Lightroom CC to my 6 year old mac book and 2 year old iMac. Macbook works. On iMac lightroom wont open. When you click the icon for it the startup window appears then just disappears.
Have uninstalled and reinstalled and same problem.
Lightroom 5 works perfect. Please help

SIgn out of Creative Cloud using the CC App, then sign back in. Adobe has posted a help file describing the fix:
CC applications close immediately after launch
Hope that helps!
MIke

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