[louis_nichols]

Something else which seemed to work for me, for items failing to open.

Search for the show/film or navigate to it on your watchlist.
At either the season or very top level folder right click select refresh. 

Yes, I had also noticed that. That was the small "glitch" I mentioned earlier.

But at this point, I can't even get to such a place. I am basically unable to open the add-on at all. (in a variation to this, I tried to trick it by disabling web api, opening the add-on, navigating to the season, then enabling web api and then entering the season - the result is the same: at next click, infinite loading)

Also noticed that there was a load of what appears to be cached metadata for the old/non-webapi addon which I removed.
Metadata was stored in the TV and Movies sub-folders, under the addon_data folder.

```
rm -fr ~/.kodi/userdata/addon_data/plugin.video.amazon-test/TV
rm -fr ~/.kodi/userdata/addon_data/plugin.video.amazon-test/Movies
```

I don't even have those folders. Might be because one (unsuccessful) way I tried to fix this has been to clear cache... Don't know.