Multi-Select Box Not Displaying Values Passed From Grid?

Coldfusion 8

I inherited an application and am trying to maintain and improve it... hit a snag today.

I have a multi-select box that is not displaying what I expect.  The values come from a ColdFusion grid which is based off a database query.

Here is the code for the select - does not work - nothing is selected:

<cfselect name="USER_IDS" multiple="true" queryposition="below" selected="USER_IDS" query="ActiveUsersPlus" disabled="#disabled#" value="G_USER_WORK_UNIT_SK" display="G_USER_ID" >

</cfselect>

Now if I change the multiselect to a single select like below - it takes the first item in the field list (from the grid) and selects it in the drop down.

<cfselect name="USER_IDS" multiple="false" queryposition="below" selected="USER_IDS" query="ActiveUsersPlus" disabled="#disabled#" value="G_USER_WORK_UNIT_SK" display="G_USER_ID" >

</cfselect>

Or if I assign a variable like this and use the multi-select code it seems to work as well.

testlist = "22,26";

...

<cfselect name="USER_IDS" multiple="true" queryposition="below" selected="#testlist#" query="ActiveUsersPlus" disabled="#disabled#" value="G_USER_WORK_UNIT_SK" display="G_USER_ID" >

</cfselect>

I have displayed the value of "User_IDs" in the grid and in the data entry part of the screen to see values of:  22,26

to make sure that wasn't my issue.

Do grids and multiselects require something additional?  Any advice on how to resolve?