When using DisplayColumns in an Applet, data not showing in iGrid.

On my 12.2 box I am using in my iGrid applet:

<param name="DisplayColumns" VALUE="{##PlantID}, {##PlantName}, {##DefaultLanguage}, {##IsActive}">

Looking at the iGrid on the page I see seven (7) rows (seven (7) rows are in the sql table), but no data is shown. All the columns are empty.

If I take out the above param, I see all the data.

I thought it might be my language tags so I tried it using:

<param name="DisplayColumns" VALUE="Test1, Test2, Test3, Test4">

and got the same thing.

Thanks in advance.