Could you please let me know the version of Lightroom installed on your computer?
Also do you get any message when launching Lightroom when double clicking on .lrcat file?
And try launching the application from the Application folder.
It's Lightroom CC 2015 and no messages when I try opening LR. I've tried it though the application folder and the same thing,nothing. There is just a flash of a "thinking" cursor than nothing.
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Are you working on MAC?
Did you try restarting the computer once?
Ha! The good old restart did it, I can't believe I didn't try that!