Theme Cloning Issue

I try cloning the default "Responsive theme: Modern" layout and while it's in "Processing" mode, it stalls out at...

design/themes/thenewname/layouts

Not sure why...any help would be appreciated.

Thanks

At first please check server error logs

The error logs have been checked.

The FastCGI Timeouts (fastcgi_read_timeout, etc.) have been increased.

Theme will not automatically install after the aforementioned is accomplished. It still hangs. If I wait a few minutes and refresh the page, I get two "responsive" themes. If I manually change the name in the *json file it changes the created cloned theme from "responsive" to "coolbaby" but when I then try to activate one of them I always get a 500 server timeout page.

I've cloned the theme manually and updated the name in the *.json file. I go back to the backend theme page and try to activate one of the cloned styles under the "coolbaby" name and I get a 500 server timeout page.