I’ve installed Events Calendar Pro + Filter Bar, and when the filter bar is active, the ajax loader just spins, and all of my events are greyed out. When I disable the filter bar, everything goes back to normal, but we need categorical functionality – which in my opinion should be included in events calendar pro, and not an 89$ add on. This is important functionality to us, and need a fix as soon as possible.
Really sorry to hear about these problems on your site! To get started here, I’m curious if you can do basic troubleshooting steps that will give us a solid foundation for more specific troubleshooting if needed: