[Jen[_5_]]

I have a problem that I assume means I have a corrupt doc, but just
wanted to double check.

Periodically, I do some work on a large document, and suddenly, ALL
tables lose their formatting. Gridlines, shading, fonts, etc.
Usually the work involves modifying styles, but not modifying the
applied table style. And once this happens, the tables are hosed for
good - even closing the doc without saving results in messed up
tables.

I have a macro to go through and clean up the tables after the fact,
but its pretty annoying. Has anyone experienced this, and found ways
to avoid or fix it?