Issue with WPBakery Visual Composer

Some strange thing happens only when I activate FixedBar plugin:
When I enter to a page or post, the Visual Composer module doesn’t show up.

No errors, no messages. I made a work around deactivating FixedBar each time I need to work with pages or create something new with Visual Composer. Then, I reactivate it once I finish editing.

If you could solve this, I’ll star sharing in wordpress groups for sure!