All products Disappeared from Categories Pages

[Jorge05r]

all products do appear on the database and each master_categories_id have a number assigned other than 0.

[Ajeh]

all products do appear on the database and each master_categories_id have a number assigned other than 0.

Also check the table:
products_to_categories

for valid products_id and categories_id ...

[Jorge05r]

Also check the table:
products_to_categories

for valid products_id and categories_id ...

Just checked and everything looks fine, the category IDs are valid, each product belongs to the correct category.