Hi,
Thank you for your message — I understand how confusing and frustrating this can be.
This is actually expected behavior and not a bug. The Blocks tab is only available when editing a page with SP Page Builder, not when editing the template layout itself. When you are inside the template editor (including the Wimble template), the builder only shows Layouts and Saved Items, which is why the Blocks tab is missing.
So to clarify:
Blocks → Available only in SP Page Builder page editor
Layouts / Saved Items → Available in both page editor and template editor
The template builder is meant for structural layout, not content blocks.
That’s also why you don’t recall seeing the Blocks tab there before — it has never been available in the template editor.
What to do instead
Add content Blocks inside:
Joomla pages built with SP Page Builder, or
Pages assigned to the Wimble template
Use the template editor only for:
Header, footer, module positions, and overall layout
Nothing is broken, and you didn’t do anything wrong — this is simply how SP Page Builder separates content editing from template structure.
-Kind regards.