It displays this message: "Adobe Lightroom 5 Cannot be opened because of a problem" - "check with developer to make sure adobe photoshop lightroom 5 works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X"
I have done all that and the problem is still the same. Cannot open Lightroom and the same message appears every time I try launching the program. HELP!!!
Which version of OS X are you running?
OS X Yosemite 10.10.2
Yosemite 10.10.2 is still beta. 10.10.1 runs Lightroom so maybe you should contact Apple and see what they broke. Apple (which I use) has been breaking a lot of things for the past couple years.
I'm running into the same exact problem and have yet to find an answer. Will update if I do.