EDIT:
Conflict with the plugin
Webcraftic Clearfy – WordPress optimization plugin
When its enabled the query monitor panel doesn’t show up.
I don’t know if it’s a specific setting of Webcraftic Clearfy – WordPress optimization plugin
Can you check it?
Thank you.
EDIT 2:
On my host Theme plugin setup when i have enabled on
Webcraftic Clearfy – WordPress optimization plugin
the Option > Performance > Exclude stylesheet/script file names
the problem occurs.
The thing is on another host different setup theme etc. With that option enabled on Clearfy the problem doesn’t occur.
Very strange
Thanks for the report, I’ll try to find some time over the weekend to look at this.
I’ve taken a look at the Clearfy plugin but it’s far too complicated for me to try to debug and has far too high a probability of things breaking, given that you can disable so much functionality.
You’ll either need to do a bit of debugging yourself, or ask the Clearfy developers if they’d be willing to take a look.