WARN: Updated discarded for item ?

[craigtype3]

I'm having a problem sending an update to a client by the IItemEventListener.Update method. I'm passing as itemName the same string (in this case "188") that was earlier passed to the Subscribe method. The itemEvent parameter is a simple Dictionary (see below) and the isSnapshot parameter is set to false.

However I'm not seeing the right data being sent in the HTTP stream - it shows only "<script>d(1,1,1,"#");</script>" and the log has the following message: "Update discarded for item 188"

The table is set to operate in RAW mode so I think any values that I send to Update should be sent to the client?

The itemEvent parameter is the following:
new Dictionary<string, string>() {
{"value1", "1"},
{"value2", "craig"}
};

Any help is appreciated, thanks!