there seems to be a tiny bug in «J51_Caitlin_J4 Version 2.0.0». If you try to edit an article in the Front-End, you get an error
500 behavior::tabstate not found.
I deleted the file /templates/j51_caitlin/html/com_content/form/edit.php and the issue has gone.
What strikes me:
There is a not «If you find you have a large amount of Custom CSS in the field above, you can copy it's contents to your templates custom.css (../media/templates/site/[YourTemplate]/css/custom.css) with the same effect.»
But there is a [css] folder here: /templates/j51_caitlin/css
Thank you and kind regards
Chris