That's odd!

Realy the only way I know of to show/hide the Time Slider is asign a keyboard short cut to it.

I know you said that you've tried every key you could to find it. The best thing to do is look in Customize=>Customize User Interface


From there, use Category: drop down and select Customize User Interface and look to see if a Hotkey has been assigned to Show Time Slider. If so see what the key is and use it or simply remove it.


FSEdge