I have seen that the problem that theme settings are not saved is well discussed in the forum. With my installation I have the problem that I can not save the theme settings within one portfolio entry.
I set the global options to “theme builder” but when I change it on the single site to inherit from theme it always resets to default.
My Server Settings are as fallows:
PHP version: 7.2.8 Required version: 5.3 and higher
max_execution_time: 600 Recommended min value 120
max_input_vars: 7200 Recommended min value 3000
max_input_time: 300 Recommended min value 60
post_max_size value: 256M Recommended min value 20M
upload_max_filesize: 256M Recommended min value 30M
allow_url_fopen: YES This option enables the URL-aware fopen wrappers that enable accessing URL object like files
short_open_tag value: YES short_open_tag=off is not supported