Sorry for the late response. Have been very very busy. 
Echoing what Morgan said, please provide some additional information if you can.
Also, with this build, you will find a log is generated when you run the App.
Please open your Terminal app. Carefully type the following:
cp /tmp/runRT-4.2-*.log ~/
Now in Finder, you will see a log file in your home folder called runRT-4.2-(a long series of number).log. Please provide this file to us or send it by email to me.