I just noticed this greyed-out button in the Media Browser. When you hover, the tool tip says "toggle production history slider". I can't find anything on the web about it.
What version of Premiere?
Post a screenshot.
I'm using the latest CC. It's the little icon in the upper right next to the search box. It looks like a clock and a monitor.
Well, I learned something new about the Media Browser's abilities, but I could not get the answer to your question. Nothing I thought of was able to enable the icon.
Maybe Kevin Monahan can come up with the answer for us.
Could be there for a future feature not yet enabled.
It's an NSA hack.