No idea why this happens.

Browser reset once worked in FF. Once. And this screenshot is Chrome.

J 3.3.4
ZGF 4 (in this case - happens in T3 too)

Try a hard cache clear in the browser

Cheers
Paul

Funny, Chrome won't allow that on the back end the way it does on the front. Still, no joy.

I guess you have tried testing this in a different browser?

Yes. the hard reset worked exactly once, in Firefox several weeks ago.... personally, i suspect a bug in Joomla.

and still no joy browser custom tab wise?

nada. nichts. nuthin.'

Any site or server caching enabled?

Errors listed in the console?

Errors? Sure. Of course.

What are the errors?

I'm guessing you checked to see if there was any issues with the database via extension manager?

Cheers
Paul

I've tried everything except draining an entire bottle of Macallan 18

What are the errors in the console?

What host do you use?

All caching disabled on site and server + any optimisation extensions?

Siteground, localhost doesn't matter. No caching

what are the errors in the console window if any?

errors in joomla are nonstop. i've learned to ignore them.

Can you paste them or attach them in a txt file?

These when i just opened a custom html

uncaught TypeError: jQuery(...).popover is not a function
index.php:2 'webkitMovementX' is deprecated. Please use 'movementX' instead.
index.php:2 'webkitMovementY' is deprecated. Please use 'movementY' instead.

With Joomla being 3.3 have you tried updating?

With a backup in place first

Cheers
Paul

I'm using J 3.4.4 on all sites.... (3.3.4 abve is a typo)