Checkbox converged will hang on the welcome page when you roll back from the test case selection page

This issue is 100% reproducible on a phone here.

Step:
1. Start checkbox converged
2. Click on "Start testing", navigate to the test case selection page
3. Click on the "<" on the upper left corner to navigate back to the welcome page
4. Try to click on "Start testing" again

Expected result:
* You should be able to see the test case selection page again.

Actual result:
* The "Start testing" button will gray out, but it stays on the welcome page.