I have the same problem, i can see the ajax filter via the developer tools/elements, like this:
<div class="nopAjaxFilters7Spikes" data-categoryid="4" data-manufacturerid="0" data-vendorid="0" data-isonsearchpage="False" data-searchkeyword="" data-searchcategoryid="0" data-searchmanufacturerid="0" data-searchvendorid="0" data-searchpricefrom="" data-searchpriceto="" data-searchincludesubcategories="False" data-searchinproductdescriptions="False" data-searchadvancedsearch="False" data-getfilteredproductsurl="/getFilteredProducts" data-productslistpanelselector=".product-list" data-productsgridpanelselector=".product-grid" data-pagerpanelselector=".pager" data-pagerpanelintegrationselector=".product-grid, .product-list" data-sortoptionsdropdownselector="#products-orderby" data-viewoptionsdropdownselector=".viewmode-icon, #products-viewmode" data-productspagesizedropdownselector="#products-pagesize" data-filtersuimode="usecheckboxes" data-defaultviewmode="grid" data-enableinfinitescroll="False" data-infinitescrollloadertext="Loading more products ..." data-scrolltoelement="False" data-scrolltoelementselector=".product-selectors" data-scrolltoelementadditionaloffset="0" data-showselectedfilterspanel="False" data-numberofreturnedproductsselector="false" data-selectedoptionstargetselector=".nopAjaxFilters7Spikes .filtersPanel:first" data-selectedoptionstargetaction="prependTo" data-isrtl="false" data-closefilterspanelafterfiltrationinmobile="true" data-no-products-window-title="No results found" data-no-products-window-message="There are no products for the filters that you selected. Please widen your search criteria."></div>
but it doesn't show anything visible on the page