Thanks for your detailed reply Steven.  I meant to reply sooner, but I've really had to spend some quality time digesting your response.  I did remove the W3 Total Cache days ago, and I only installed that as a trial & error as my host company told me W3 Total Cache was their recommend cache plugin.  But I found W3 really slow and it actually caused my pages to take longer to load so I went back to the cache plugin that I've always been using, that comes with the Wordfence Security plugin.  But I tried loading pages with and without a cache plugin, and it made no difference.

But what I need to point out again is that this intermittent Juicebox error is not occurring as a result of a slow page loads because the error can appear instantaneously.  That is, the moment a page may load, the Juicebox error will literally appear within a millisecond.  The Juicebox icon splashes on the screen for a millisecond (can;t even see it), and then immediately, the Juicebox error appears.

I still need to find where the "PHP set_time_limit directive" is located but if that's in my php.ini file, I believe it's already set to 60 seconds.

But all if the following that you referred to is created and provided by the third party company. You mentioned: "I notice that your gallery's XML file is generated by a PHP file but the configURL (the URL for the PHP file) is first generated by a JavaScript function.  Also, your web page loads files from several different domains and includes approximately 40 external JavaScript files and 30 external CSS files." 

All of those feeds are provided by the third party plugin company Diverse Solutions

After looking at other real estate websites that use the same plugin, I've noticed a pattern...  that most all of those other companies are paying for a dedicated server so their pages load much faster. I believe this plugin is so dang clunky and resource dependent that it works best with a dedicated server, and the techs at Diverse Solutions sort of agreed (they didn;t say their plugin was clunky, but they did agree a dedicated server is best to have).

It will be a lot of work for me to re-implement and install a different company's IDX plugin into my system, but I'm thinking about going in that direction because I don't have the $120-$150 per month for dedicated web hosting right now -- even though I'd have to make those changes to over 300+ web page within my site.

Anyway, I sincerely appreciate your time and response and I will provide additional information as I uncover it, in case it may help anyone else who is experiencing the same error with the Diverse Solutions dsIDXpress plugin.  But again, the addition of the php.ini file helped remove a lot of the errors I was receiving so to my novice eyes, I really feel the problem is with Diverse Solutions.

Thanks again!

Frank

I'm at a complete loss, so I'm hoping someone can provide their most logical answer as to why I'm receiving an intermittent Juicebox error.

I use the WordPress theme Total by WPExplorer for my real estate website http://mrtownhome.net

I also use a plugin from Diverse Solutions which uses Juicebox on their servers to display real estate listings on my website. The plugin provides listings of houses for sale, and Juicebox provides the photos/slideshow.

Juicebox itself resides on the Diverse Solution server, and not with my hosting provider InMotion.

A PHP file in the Diverse Solutions plugin, which is on my server, calls up the Juicebox from their servers

Diverse Solutions says the intermittent Juicebox error is being generated because something within my Site is preventing intermittent access to the "client-assist.php" file.  This is a screen shot of the error: http://cl.ly/fCfR
This is another screen shot provided by the plugin provider: http://prnt.sc/a4hvw3

I've spoken to techs at both Diverse Solutions and with InMotion, and I've already tried and implemented many of the simple "fixes" first such as:

> make sure file permissions are correct
> added a php.ini file to allocate more memory
> make sure there's no "www" preceding my url anywhere within my host
> make sure all plugins are approved for my hosting provider
> make sure no other plugins use Juicebox (which they don't)
> cleared all cache and only using approved cache plugin (W3 Total Cache)
> tried different computers with different IP address and still get intermittent error

I think I saw a drop in the amount of errors after creating the php.ini file, so would this be enough?

-max_execution_time = 60    ; Maximum execution time of each script, in seconds
-max_input_time = 60 ; Maximum amount of time each script may spend parsing request data
-memory_limit = 256M      ; Maximum amount of memory a script may consume (32MB)
-max_input_vars = 4000

So based on this information and the screen shot, do you feel this error is more likely with my hosting provider, or is the issue more likely within the PHP file from Diverse Solutions?

I just wanted to go straight to the folks and users who know this plugin best, to see what your thoughts are.

Thank you so much for taking the time to read this!

Frank Biganski
Virginia, USA