Advanced Layerslider Not Showing in Front-end

Hi

Because of the pandemic, work on a client’s site has been paused for more than a year. Returning to it now, I see that the Advanced Layersliders no longer seem to work on the front-end in various browsers. The spaces they previously occupied are now just blank white – although there is underlying source code.

Before I do a backup and full scale investigation, I wondered if there was a common issue that has already been identified and whether there’s already a known quick fix, which would be useful since it’s a live site. I’ve read through numerous pages of Layerslider problems so far on this forum, but I haven’t yet seen matching circumstances that I can follow.

Here are the basic details:

Website pages showing the slider problem:
https://gotravelscotland.com (Blank slider areas at top.)

WordPress: v5.7.1
Enfold: v4.5.1

The current site was built in 2018 (although it superseded a legacy one I wasn’t involved in) and all of the current site seems still to be functional apart from the two Advanced Layersliders not appearing. (In admin they still appear to work okay.)
Because work with that client was put on hold in early 2020, I don’t know when the sliders stopped displaying.
Neither the Enfold theme (v4.5.1), nor any plugins have been updated in that time.
The only thing that has changed, as far as I am aware, is that GoDaddy (who the client hosts with) will have automatically updated the WordPress version (now v5.7.1) – and that is what I’m presuming will have triggered the problem.

I’ll be planning to backup then progressively update everything as a matter of course, but naturally I’d be happier having these sliders working properly first, instead of perhaps making matters harder to troubleshoot by changing so many other factors at the same time.

If the support team has knowledge of any quick fixes I could try first, I’d be very grateful.

Thanks for your help!