[CentOS] Strange behavior from OO Writer

I just had the strangest experience I can remember since I ran
Windowsas my base OS....

Yesterday I was editing a file in the OO Writer (word processor).
Today, it will not open.  I copied it to a new file, and it opened
fine.  I edited it, updated it and closed it.  Then I tried deleting
the original file and copying the new one to the old name.  Won't
open.  Renamed again, and it opens fine.

WTF????  Does OO and/or the writer have name prejudices that develop?

Thanks.

mhr