Ship Via Error Blank Title 94952

We are on Vantage 8.03.408B and we often have trouble when entering the Ship Via on Sales Orders. We upgraded from V 6.10.543 in February 2010, and have had trouble since then. If does not happen every time, but when it does, it takes a long time to correct it, and we usually cannot duplicate the correction. Today, I am adding a new release to an existing SO and when I try to save, I get this error message regarding Web Description:

"Error! ShipViaCodeWebDesc cannot be null."

This particular Ship Via already has a ShipViaCodeWebDesc in the Ship Via file. If I change to any other Ship Via, I get the same error message. We do not have the Shipping Module with the Manifest Information, but I have also noticed that I have not been able to add Web Descriptions to some of the existing Ship Via's, because I get this error message regarding Intrastat:

"Error! Intrastat is not available. Entry of data into the IStatCode field is not allowed."

Â…and I am not only NOT trying to enter an Intrastat Code, but the field is actually grayed out.

Has anyone else had either of these problems, and if so, what did you do to correct them?