Whoo! It was the autofilter!

I had gone through previously and checked the filters individually to
make sure they weren't on (since we use them quite extensively to look
at data in different ways as we complete analysis each month), but I
hadn't turned them completely off. Once I turned them off, and then
back on, everything reappeared.

Thank's a bunch! Now I know the pesky autofilter trick. ;)

Kirsten