Hi, I installed VM version 3.0.17.4. The administration in the categories bad displays a list.
I uploaded back to the folder / administrator / components / com_virtuemart / views / category from VM version 3.0.16 and categories report is displayed correctly.
Same happening to me with 3.2.8...
Installation error? Install the current version 3.2.12 http://dev.virtuemart.net/projects/virtuemart/files