1. I used the add image button, and it didn't grab any image source url from WP library.
2. I manually pasted in image source url, still didn't work
3. deleted the plugin
Not working on my Site. Does not do anything.
I use Enfold WP theme - one of the top 3 selling WP themes. This WP-Backgrounds Lite plugin's settings menu only has 5 fields: 2 fields for z-index, 1 for background color, 1 for content position and 1 for ID/class.
There's no option whatsoever for choosing random images for the background for all the pages and posts.
I found out that one must assign the image in each single post and page. If you have 100 or more pages - it's literally mission impossible and a huge waste of time.
Then I found out that you only get to choose 1 image only.
And on the top of it - it does not work, even after trying out all possible z-index variations.
Many bugs - the fields that are supposed to contain default values, contain other values, etc.
Verdict - this plugin is totally useless, and is only released in order to promote the author's pro-version of the plugin, which, of course is not free. I'd strongly suspect that many of the good reviews of this plugin are not genuine.
I now found a good background-slide plugin which is very lightweight, simple and effective - "Full Screen Background Images" (https://wordpress.org/support/plugin/full-screen-background-images). It's very recently updated and compatible with WP 4.0
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