Yeah, most of my addons have that problem. So far only one addon doesn't do it ( or didn't a few patches back on PTR.
I think as long as you do not change any of the Blizzard frames and it seems variables there is no error.
The Options frame also has issues with certain addons being active. I haven't tied it down to anything specific yet, but thought it was linked to a custom option frame that bugsack has or just the simple use of saved variables.
*runs off to check that one addon that doesn't break*
Yep, it still doesn't break the edit mode or options access.
Here is a link to it :
https://drive.google.com/drive/folde...28?usp=sharing
The only thing it doesn't do that nUI does ( which causes the issues ) are reparenting Blizzard frames.
Once I get nUI working reasonable well ( other than these error messages ) I'll be starting on my other addons so I am sure I'll find a mixture of ones that may work or not work without those errors.