HELP!!! OPEN OFFICE WRITER

Before taking too much trouble with this rant, check the last line :-)))
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Does anyone know the ins and outs of this damn word-processing thing?

I must have hit a wrong key combo-- no matter where I put the cursor, it
selects the whole line (or more, if I move the cursor). But I can't copy the
material, nor drag it-- that just selects more. If I try to type, the
selected material deletes :-((((

The last key I hit before it started doing this was "Page up", I was also
using the find dialogue.

It's also affected my email (MSN)-- when I click on a message title, it
selects all the titles, and doesn't open anything. (And so I cant find the
last msg from OO Help to get their address.....) It seems to have affected
my Yahoo home page, too-- I can't scroll it. Perhaps it's a bug somewhere
beside OO Writer??? IIRC, last time it also affected MS Word.

It did this to me a week or two ago; it solved itself after several openings
and closings of OO and various files.

Absolutely maddening.
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2mins. later: tout a coup, it has resolved itself again. WTF!!!! Situation
back to normal...for now, at least, insh'Allah.  Any thoughts on what may be
happening???