Hi there,
In 1.2.9, we added the mobile media query to the call for the stylesheet. This enables us to change the mobile breakpoint easily.
What I didn’t consider is that caching/minifying plugins completely ignore the media query made within the call to the file, which sucks.
I’ll be releasing a new version today which reverts back to the mobile query within the file (which makes it non editable).
For now, you can go into your caching/minifying plugin and ignore the mobile.css file – this will fix your problem.
Let me know if you have any questions 🙂