I ran into a very similar problem, Excel Reports does not show my templates, although I did not install or update anything new. I checked the console and found a considerable number of errors there. I'm not sure what else I can check. Literally last week, everything worked fine, without any problems, and for some reason, the whole system decided to break down. I tried to do Phillips steps, but it just seemed to make everything much worse. I have a unique integration for Excel spreadsheet installed on my computer, which looks like this https://www.coupler.io/excel-integrations/airtable-to-excel. Not sure if this integration can affect the work of mango? I don't know what to do next, so I'll be waiting for your answers!