Hello, my friend,
Under certain circumstances it can be normal that the cache folder is empty. The Adaptive Images plugins only creates the resized versions of images when it decides it is necessary, combining your settings, each device’s dimensions and each images dimensions. However, it would require a bit further debugging for us to be absolutely sure. Could you please perhaps share your website url with us and the full results of the Print debug and Print diagnostics buttons in the plugin settings page?
Also, another thing you should note is the way you are actually testing if your images are being handled correctly by the Adaptive Images plugin. We recommend either a service like http://webpagetest.org/, which can be set to run your website on real mobile devices, or by entering your browser’s Developer Tools in Responsive web design mode and inspecting the downloaded images from there.
Let me know how it goes!
Cheers,
Takis
