Hi Maeve,
thanks for getting back to me. I have been trying other solutions but wasn’t really happy with anything so I’m back. Since I was getting 404 errors I tried changing the permalink structure to default. After that I could open the catalogue entries. Then I switched back to “Post name” permalinks and the catalogue is still working.
When I installed your plugin I had selected “post names” so maybe the settings didn’t get picked up by the plugin?
Either way, one workaround is to change the permalinks to default and back. That fixed it for me.
Thanks for your work!