A client who was using Invoices 9.3A (181120) and GridView 9.3B (181201) is having the same issue with their GridViews breaking as described above.
I updated them to the latest Invoices hotfix and GridView service pack, and it didn't fix the problem.
I also tried restoring to an earlier version of the GridView report, and it also didn't fix the problem.
The symptom is that for reports using the QI Detail w Header table, the Customer Name changes to Status, the Ship-to State changes to Ship-to City and the Date field changes to Invoice #2. There are probably others but these are the only ones I found on the report. Note that they are all Header fields; the Detail fields seemed to be OK, thankfully.
I was able to manually fix the two affected reports for this client. But I'm worried if this is the tip of the iceberg.
Thanks
Steve