I did some additional troubleshooting this morning and I think I have pinpointed the issue.

When the jqGridExport method is called and type jsonstring is used the “filters” section looks like this:

“filters”:{“{“groupOp”:”AND”,”rules”:[{“field”:”param1″,”op”:”eq”,”data”:”data1″},{“field”:”param2″,”op”:”cn”,”data”:”data2″}]}”}

However the string should look like this:

“filters”:“{“{“groupOp”:”AND”,”rules”:[{“field”:”param1″,”op”:”eq”,”data”:”data1″},{“field”:”param2″,”op”:”cn”,”data”:”data2″}]}”}“

Notice that the export function is not placing the filters inside of double quotes.