I have restarted my workstation , but it still does not show up, I have been working on this assembly for a few days w/o any issues until this AM
Seems your UI settings were saved in .wf. Reset back to original.
There was another solution for that Post ... more specifically it is
"Rest Panels Position" is available under File > Options > Window Settings "Rest Panels Position".
Your saved settings are under the .wf folder you renamed.
Copy the .settings file from your old renamed .wf folder to your new .wf folder.