Trying to insert a formula while OOo Writer is suggesting an autocompletion for
a word you were just typing causes a fatal crash.  On my machine, this is
reproducible:

1) Open up OOo Writer and create a new text document
2) Start writing out a word that is common and that OOo will recognize and try
to autocomplete. (For me, for example, typing out "Wherever we go", then
entering a newline and typing "Where" gives me an autocompletion for "wherever".)
3) As soon as OOo tries to autocomplete it (i.e., provides a highlighted
completion and waits for you to either accept it by pressing "Enter" or continue
typing), stop.  Do not accept the completion or get rid of it by typing anything
else.
4) Insert->Object->Formula.  At this point, on my computer, the window pops up
at the bottom to insert a formula definition, but immediately the cursor turns
to a cursor with an hourglass and OOo stops responding.  After a few seconds,
the OOo Error Report window pops up and Writer dies.  (For what it's worth, the
document that was being edited is restored successfully after restart.)