The sorting in category view does not work the same, expected way as with the original VM-Template.
This, as all manufacturers are shown in the dropdown-menu, not only those related to the articles in the current category.
Another issue is, that custom userfields (cart variant - in our specific case different packaging sizes of cigars) are not visible/selectable in article detail view.
We have fixed the Manufacturer error now and will release a version soon here.
When it comes to the other problem we have taken a decision that if the product have custom fields they will not show in category view. Sometimes there are 4-5 custom fields. We might however consider having a param to show them here with an warning that only 1 custom field (maybe two) will fit.
Please just update the plg_mowebso_vmuikit.zip and it will sort out the manufacturing problem.
But the other problem we are not sure how we will fix. We have made VMuikit so it works with alot of sites and if we enable custom fields in category-view alot of website will have problems. So we have decided that we will not show that. If there is Custom Fields then user have to enter Product details to choose more. Thats why we show no Add to cart when Custom Fields are available .