I created a customer group but if I add a customer into this group he does not see any products anymore. If I switch him back to group "general" all products are visible again.
How do I make products visible to a customer group?
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The solution to this problem is most likely going to be re-building the price index. Without building the price index, or saving each product individually, there will be no price index values for the new customer group.
catalog_product_index_price table you'll find that there is a row per product for each customer group. These indexes are joined onto the product collection in a way which causes the products to not display on the listing pages where the indexes have not been built.
Building the price index will build these records for all products and customer groups, allowing the products to be displayed to customers belonging to the new group.