I don't have a guess where this is coming from -- or what it is...

When you rightclick on it, you should see its name in the Namebox (to the left
of the formula bar).

What do you see?

And do you see anything in the formula bar when you select that thing?

And depending on how you've upgraded excel, you could have multiple XLStart
folders. Are you sure that there's nothing in any of them?

johnalexwood wrote:

Every time I load Excel, an empty box/worksheet pops up as well as an
ordinary usable worksheet. It's just annoying coz I have to close the empty
one every time. It causes no other problems.

I have nothing in the XLSTART folder nor "At startup, open all files in".

The box has only a title bar and up/down scroll bar. No toolbar nor menus.
If I maximize it, it only fills half the screen.
If I right mouse click on the title bar, I get Edit, Default, Properties.
If I select Properties, I get 4 tabs: Options, Font, Layout, Colours.

Any idea what this is and how to stop it popping up?

--

Dave Peterson