Does Not Work -> WP 3.9.1

I can confirm this. Too bad!

Can confirm this too.

The Request tab is blank, the Object Cache tab outputs data. So yes, something concerning collection of Request data appears to be broken.

Having the same here, there is markup in the relevant “debug-menu-target-Debug_Bar_Request” div but can’t select between tabs

I can confirm this too, WP version 4.0

Screeshot:
https://img42.com/PKjzu