Row Header and Worksheets gone missing

[ChrisNeedsHelp]

Hi there.

I've a file I'm working on and for some reason the row header and worksheet selections aren't visible.

I've tried looking at a new worksheet and they are.

I've checked the options/Advanced settings and "Show row and column headers" is selected, as is "Show Worksheet Tabs".

The View Headers is also selected.

Can anyone help?

(The file also seems to be using a lot of CPU power...)

No row headers:-

No worksheet selection

But is ok on new worksheet

[#2]

Such is the way, that after asking a question a solution often appears.

I clicked "new window", then saved the new window which seems to not have the problem in it.