Workaround
Review production jobs. Make sure all of the production jobs have completed (successfully or unsuccessfully). If any production jobs are paused finish them. If the issue is not corrected perform the steps below:
1. Navigate to folders
2. Open the production folder and choose Edit the locked production folder
3. In the browser URL bar paste the following line then press Enter:
javascript:alert(Ext.getCmp('unproduceButton').setDisabled(false))
The action above will pop up a window similar to:

4. Click the OK button
5. The Unlock/Unproduce button should now be enabled
6. Unlock the folder as normal.