[libreoffice-users] searching in Calc does not find anything

Good morning
For years Crtl+F and then entering entering numbers or words used to 
find those, if they are in the sheets somewhere.

For a few days now trying to find anything, numbers, digits, words ..., 
ALWAYS gives me
"Search key not found", even if the item in question sits right in the 
middle of the screen.

I tried all sorts of settings and options in the search box.
Apparently I am not smart enough to figure out what I am missing.
I would be grateful for a hint.

Thank you
Thomas

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