I made two changes:

Changed a field from text to text area in the admin form.

Added two categories and moved an existing category to be a child of the new category.

I looked to update an item that was in the moved category and I get the error message:

Oops! Template not found.. :(

For one of the affected items I tried saving as suggested in another forum thread for Seblod v.2, but that resulted in the item getting renamed to a date, and still has the same Oops error when trying to edit it.

I have several questions:

1. Can I fix this or must I delete and re-enter these custom content types?

2. Is it safe to re-categorize items or shift the category organization when there are items in a category?

3. Is it safe to change a field type for a field in a category that is populated with items?