rooscoota Thanks for your response.
Well I'm using a standard account/user on purpose for security reasons. I use my admin account only for admin tasks like installing, uninstalling apps and other...

rooscoota That's the problem i can't find my installed themes when I'm in my non Admin account/user the Select Dropdown will only display standard system themes.

Thanks for your response, unfortunately this solution didn't work

Hi, I'm having this problem for a long time every time I spend many hours searching & trying but couldn't find something useful. I thought maybe I can get the right answer here.

What I want to do...