Producuts have suddently vanished from frontend

[martinajordan]

Hi,
I have no idea if this is really a bug but Virtuemart isn't showing anymore products on my website. In the backend everything is fine, products are published etc. A third party module I use also still shows the products, but Virtuemart itself seems empty. Can anybody help me to understand what happenend and how I can fix it?
Thank you so much in advanced.
Martina

I am using Virtuemart 2.0.18a