I purchased the license for the pro version of your software, and I have it installed and i have setup w3 total cache as suggested, but i still sometimes get served the mobile version on desktop or the desktop version on mobile. Depends which gets cached first after the cache is cleared.
I’ve been pulling my hair out trying to figure out where i went wrong.
I was using APC cache and i’ve even switched to basic disk cache but that did not solve the problem. I have disabled minification and now I am only doing page caching and i still have the issue.