Hello

As administration, I was restoring a course, used the Restore option in the Front page settings (FireFox browser), the restore appeared to go well then hung with a blank page.  Openned Moodle in IE to see if course had restored - it had.  Closed the Firefox tab & reopenned and my Navigation block has disappeared.  Checked in IE and it is missing from there as well.  Checked Blocks in the Plugins and Navigation is listed; tried customizing and Navigation is not one of the blocks available to add. 

I logged in as faculty in IE and the Navigation block is missing under that login as well.

The other Moodle administrator in my office still has the Navigation block so I am guessing that whatever happened was on my local machine but have no idea what or where to look.

Any help would be GREATLY appreciated.