This ties into a question I asked earlier, but the more I look at it the more it seems like a larger issue. I also saw a question in the Pure & Simple category similar to this that wasn’t really resolved.
The excerpt functionality doesn’t seem to be working.
In Pure & Simple the Customizing > Basic Settings offers a field to limit the Excerpt Length. Also in Flat Responsive in Customizing > Basic Settings > Blog Setting there is an Excerpt Length field. It has no effect in either of these. I can set the length to 50 or 500 and nothing changes.
But the Sleeky Pro does not offer an Excerpt Length field in Customizing. You can use the WordPress Settings > Reading to choose a Summary instead of a Full text, but choosing that option doesn’t have any affect on the Posts page.
I suspect that buried in the php files for these themes the “support” functionality and accompanying action for the excerpt field is broken somehow. I can’t confirm this because I haven’t found the fix.
I’m wondering if you can take a look at this issue as it affect several of your themes.
Also, as a side note, the Customizing features in Sleek Pro don’t all work. For instance, in the Color Settings, I know Content Bottom Widget Background, Bottom Widget Background, Right/Left Sidebar Background, Content Link Color, Breadcrumbs Text color overrides both Breadcrumbs Link Color and Breadcrumbs Link Hover and a few others don’t work. You may want to test all of those fairly soon.