This problem occurs for me whether I use Gradle 1.2, 1.3, or 1.4RC2 .
After my tests get to the end, and the last test is finished, the Gradle GUI will not accept any mouse input, appears to be locked up at either 11% or 88% , and doesn’t seem to ever finish (although I never waited more than 10 minutes).
This issue is new for me BUT I posted an issue previously that I completely resolved, where the command line Gradle and Eclipse gradle was hanging up at the end of my tests because I made the mistake of not cleaning up an object, but now that is no longer a problem. See post at: http://forums.gradle.org/gradle/topics/help_my_gradle_script_hangs_during_build_at_end_of_tests
My test project (that I am using to learn this Gradle stuff) is located here if you want to try it: https://github.com/djangofan/WebDriverTestingTemplate
I hope someone is able to look at it and help me. Just download the .zip archive of my project, unzip it, and run the “run_gradle.bat” file and choose “Gradle GUI” from the menu. -Jon