Build does not run.

Build/Build & Run creates file, but does not open. I've tried several architectures (x86, x86_64, universal) for Mac OS X. No error/warning messages. Double-click on the build file in the project folder launches the build to the dock, but it does not open/run. Only difference, that I can see, from previous successful builds is that there is no Version listed in the file info pane. Using Unity 5.1 Personal. Any suggestions for remedies are appreciated. Salut.