H E L P P L E A S E !! "Lost everything". Cannot show categories and products

[janbso]

With latest VM 2.0.0 and Joomla 1.5 I have some products and categories registered. Suddenly I must have marked one of the categories to Top Level Category or something.
I had 25 products and 2 categories and now none of these is shown.
Nothing is shown either in products nor category. In statistic I can see the correct number of products.
What shall I do to get the products back?

Please help. I am so confused.

[PRO]

Is it a multi language thing? If a category or product only has 1 language filled in, and your default language is another, they do not show