I've had the same thing happen under OOo 3.2 and also in LO 3.3: I have a document containing a bunch of tables. Some of them have formulae in them. After saving, sometimes, writer puts those formulae in all the tables of the document, in all cells.
When you open the document after this happened, everything looks fine, until something causes the formulae to recalculate. Then, all the content is lost, and all you see is **Expression is faulty** all over the place.
Because I don't know what exactly triggers this bug, I'm not able to give exact steps to reproduce.
This bug as been previously reported on:
and is fixed on the master branch by this commit:
(In reply to comment #1)
> This bug as been previously reported on:
*** Bug 33908 has been marked as a duplicate of this bug. ***