Incompatibility with LayerSlider plugin?

Hi!
I’ve been using Hummingbird on my client’s site for a while and it’s worked great!

However, I believe that Hummingbird may now have problems with the LayerSlider plugin.
I had the LayerSlider CSS file minified and the js files minimized and in the footer… That had been working for over a month but stopped (I believe) with the latest Hummingbird update.

I checked for problems of conflicting with other plugins – Didn’t help.

There is no caching other than Hummingbird.

In Hummingbird Minimized, I set all files to “completely off” and cleared the HB cache. Problem persisted.

I turned Minimization off – Problem persisted

I went to uploads to see if cache files removed. All Hummingbird cache files gone except for for LayerSlider CSS HB cache file. Removed that file and then LayerSlider worked.

Enabled HP Minimzation (still all files set to “off”) – LayerSlider stopped working. (checked uploads folder – still no HB cache files.)

Disabled HB Minimization – Layerslider now works.

So… The bottom line is… With Minimization “off” for all individual files and no HB cached files existing, toggling the HB Minimization button on and off blocks the LayerSlider from working when set to on.

Obviously, the HB Minimization is still doing something that breaks the LayerSlider when it’s “on” even without any files being minimized, put in the footer, combined or deferred.

Some further information… I turned WP Debug on – There were no errors

The shared server is HTTP/2 – Minimization indicates that combine is not available.
PHP is version 5.6

Any clues as to what’s going on?

Thanks!