" Specific images for Mobile Options" folder for Mobile Responsive images

I mean : Options >> Style >> Edit button >> opens the styling interface
in it : Slideshow >> Navigation

you will find the color settings

for the issue : give me the url of your page with the slideshow loaded
you told " the extension stop to work" when you enabled the specific image for responsive options. But does it crash the page, or only the slideshow ?
if it crashes the page >> enable the debug in your website configuration and give me the error message
if the slideshow stops >> enable the option and tell me

PS : I see that you have sent your url in a new thread on the forum ... the best solution would be to post it here and not in another thread

PS : your website is under maintenance, I can not check

unfortunately this is possible only on PRO version.
Just a quick question: how much costs the Pro version of this extension (not the entire extension pack)?

now it is online

for the grey background, you can change it using this css code to put in your template adapt the color to your needs

for the slideshow, I see it working correctly (no responsive image). Please enable the option and tell me so that I can check the problem directly