Hey guys, Rob from Modern Tribe here. Thanks for the heads up here; while I’m bummed to hear you’re facing difficulties, it’s worth noting that it does sound like this problem is one that could be relatively easily addressed. It is correct that we’ve found the majority of users who encounter this problem are seeing either a permalinks or a theme/plugin conflict. In many cases, users are able to identify a plugin or theme conflict, deactivate that theme or plugin, and flush their permalinks from there to get a resolution. In most other cases where this has been reported, even when there isn’t a conflicting plugin/theme, the permalinks flush does the trick.
Have you tried resaving the permalinks page? I notice that Trollhunter, you suggest just visiting the permalinks page – but I’ve found for me it usually takes an actual SAVE of that page (even if no change was made) for this to take effect.
It’d be understandable if you weren’t able to get this sorted and had to move onto another calendar, but that would be disappointing as it does sound like this is something we can rectify relatively easily. Please let us know whether that gets you sorted.