I’m afraid I don’t know the answer to the question. It’s likely something pretty esoteric – multiple versions of RW, or a custom add-ons location that doesn’t have sandbox permissions or something like that.
But here’s what I’d recommend:
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Set the custom location of your add-ons folder to be somewhere really boring. Like your desktop or home folder or Documents folder. Avoid Dropbox and iCloud and Google Drive and other places that are going to be affected by some outside app or utility.
This isn’t a permanent move, this is just to eliminate some sources of potential issues – hopefully by simplifying the setup and eliminating enough things we’ll narrow down the issue until there are not many complex things left. -
Do a clean-up of your addons folder. Eliminate all but the addons you absolutely need right now. Again, this is not a permanent change – just trying to narrow things down. Some old, out-of-date, plugins that you’re not even using could be causing issues and you wouldn’t even know it.
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In the Gear menu under the Stacks Library, choose Show Stacks Library in Finder. Make sure that the Stacks library that is opened is really the same one that you just set the custom location to.
If any one of these things happens to eliminate the problem – then, well, that’s a big clue – and you can likely use that info alone to help you isolate the issue a bit.
But I suspect the issue may still remain even after this – in that case report back what you find. What things remain in your add-ons folder, what items show/don’t-show in the Stacks folder?
I’ve also use your question as a starting point to talk about the add-ons folder, all the constituent parts, how to use each one, and how to clean things up. It’s not really an answer to your question – but it is related. You might want to have a watch if you have a bit of extra time.