Matt,

When you pack the table it gets erased and for a moment there is no table there with the proper name. That sends the grid into lala land (that's a technical term).

Before you pack you should;

Thisform.grid1.recordsource = ""

Then after the pack;

Thisform.grid1.recordsource = "YourTableAlias"

It is also a good idea to avoid packing tables interactively as it can be a very time consumming operation which your users probably won't appreciate.