Domoticz

New install of 2021.1 on a newly configured RasPi4. When I open Setup/Hardware, no Add button appears. Everything else is there; drop-down list of hardware, name field, type field, etc. But no Add button and nothing I select in the work area causes an Add button to appear.

Any idea what might be causing this? Perhaps I messed up a configuration?

Clear your browser cache or try your browser in incognito/privacy mode.

Amazing! I opened a private window, hit my RasPi, and there is the Add button. Thanks a bunch!

Now, can you explain why the private window is necessary? I'm curious...

Using the privacy mode proves there is something in your browser cache that stops showing the add button as the privacy mode clears tthe browser cache automatically. Domoticz uses a lot of JavaScript for the webUI that will be stored in that cache.

So please clear your browser cache:
https://www.domoticz.com/wiki/Browser_Cache