Any additional information you can share will help us troubleshoot this issue. Thank you.
Navigate to TheBrain in the Applications Directory and select SHOW PACKAGE CONTENTS in the Finder window, you can find the output.log file in the Contents > Resources > App folder.Thanks,Matt
The problem is not related to theBrain but to MacOS Sierra ! I have the same problems with many other programs , the first drag to the target app it's ok the second one don't pop up the target app.
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