Custom fields disappeared after updating to 2.6

If your custom fields disappeared after updating to 2.6 this is how you can fix it quickly.

Go to Groundhogg > Tools > Install & Updates

Select Groundhogg from the dropdown and click view updates

Click on 2.6

Click Yes, perform update 2.6

Once complete, your custom fields should be reset to the same state as before you updated to 2.6. Any field mapping or anything else linked to your custom fields should also be restored.