overtype highlighted text no longer works as it used to

[windoz]

A couple of days ago, something changed, and I have no idea what.
Previously, when I highlighted a block of text and started typing, the
entire highlighted block of text was replaced by the new text I typed in.
Suddenly, this is no longer happening. If 'overtype' is off, then the new
text gets inserted before the highlighted text (which is no longer
highlighted). If I set 'overtype' on , then it overwrites, but does no remove
the entire text that was highlighted.
In short, highlighting the text prior to typing achieves NOTHING AT ALL.
My only way around this is now to highlight, and press the Delete button,
and then continue.
But old habits die hard.

WHAT has happened? Have I accidentally changed some setting, and if so,
which one?

thx

 

[windoz]

and <red-face> found the answer in a different area - by searchign for
'highlight' instead of 'overtype' that I used previously. OOOPS>

answer is indeed a setting - Tools -> Options -> Edit -> and 'Typing
replaces Selection'.

no idea how it got 'unticked'....

fixed now.

great Community