After upgrading Jun 2017 release the Widget was not working properly ?
Resolution: Deleted all widgets from sheet and install them one at a time to discover which widget was causing the other widget to work improperly.
Step1: Make duplicate of app.
Step2. Open sheet
Step3: Go to sheet that has the widget install and highlight that widget and remove it.
Step4. Do this for all widgets incorporated in all sheets applied to the app.
Step5. Once all widgets have been removed
Step6: Go to the Custom object and add your widget back to the sheet. Save Sheet and test widget.
Step7. If widget is working go to Custom object and add the 2nd widget to the sheet. Save and test widget.
Step8. Continue to add widget back to sheet until you discover which widget is the cause of your issue.