500: Out of memory error when trying to edit grid

[kit]

Hi,

I am using CGDevTools Version: 4.1.0.319 and IntraWeb Version 15.2.68.
The grid has 5 columns and about 12-25 rows when loaded. I am loading it with an XML String.
It is set up with the following:
Grid.JQGridOptions.Scroll := True;
Grid.JQGridOptions.GridView:= True;
Grid.JQGridOptions.ShrinkToFit := False;
Grid.JQGridOptions.PagerVisible := False;
Grid.JQGridOptions.CellEdit := True;
Grid.JQGridProviderType := 'Cells';
Grid.JQGridProvider := DataCellsProvider;
Grid.JQGridOptions.DataType := gdtXmlString;
Grid.JQGridOptions.DataStr := XMLString;

It seems to load and display fine. 3 columns are set to be editable though and after a couple edits I get the following error.

500: Out of memory error

Any idea what I might be doing wrong?

Thanks,
Kit