Hi Jan,

what is funny similar messages gets also WordPress and Drupal users...

I think this time you should ask JCH Optimze developer why it happends. I can support only our product, without modyfications made by extra extensions. Later you can share what answer you will get.

Thank you, i just sent them a mail. i ll update here to share the solution.

thank you, I'm curious too. Because I use this extension (Pro mostly) myself on several pages and it's OK there.

Maybe difference is here, i use the free one. What the pro have in addition in relation with css optimization do you know ?

This is also not question for me, but developer. There are differenes for sure, probably not only in settings area.