Open the Shopify theme editor and check the message in the empty block. A block can be hidden because the app embed is off, your plan does not include it, or there are no reviews for its source.
Enable the app embed
In Shopify admin, open Online Store, then Themes.
Click Customize on your active theme.
Open App embeds.
Turn on Reviewsion Core.
Click Save.
With the embed on, blocks included in your plan can load their reviews.
Check your plan
All Reviews and the Star Rating Badge are included in every plan, including Free. Other blocks, including All Reviews (Grid), need Standard or Pro. Product Summary needs Pro, including during a trial. A Standard trial does not include Product Summary.
A block outside your plan stays hidden on the live store. The theme editor explains which plan it needs. For example, it says "The Reviews Carousel block requires the Standard plan. You are on the Free plan, so the block stays hidden on your store."
If your subscription is Inactive, blocks stay hidden too. Open Reviewsion and choose Free, Standard or Pro to keep using it. Your reviews are safe; paid features come back with a paid plan. Cancelling during a paid trial ends the plan at once; cancelling after the trial keeps it active until its end date.
Check the reviews and source
Open Reviews in Reviewsion.
Check that your imported or collected reviews are present.
In the theme editor, open the block's Source setting.
Select a product with reviews, or clear Source to show shop-wide reviews.
On product pages, the current product is selected automatically. If it has no reviews, a product-specific block has nothing to show.
Check media for media carousel
Media Carousel needs reviews with photos or videos. It is included in Standard and Pro. Videos are not imported on the Free plan. Photo and video uploads need Standard or Pro.
If the block still does not show after these checks, contact support from Reviewsion and include the block name and the message shown in the theme editor.