Hello Martin Richta,
Thanks for your comment.
I have to inform you that we've closed the project and stopped the development and support for the Store Manager for VirtueMart. At the moment the product is offered as-is, unfortunately, no further work for this project will be done.
Please make sure that you disabled caching extensions as they may hold the changes that were made in the Store Manager.
Just in case, feel free to use the online documentation > https://virtuemart-store-manager-doc.emagicone.com/
Have a nice day!