Can you describe what you're query is trying to accomplish?
Try using TV with your user field, 9, and with Record ID, 3 (or XEX), and what type of field is 13?
In looking at your original query, you mention you used it before, yet I'm not sure 'NE', 'GE', or 'LE' are supported. If you're trying to use a "not equal" to, then use 'XEX'; if greater than or equal to use 'GTE'; and less than or equal to 'LTE'.
If you work your query in chunks, say starting with Dates, do you get records? And then if you add the status check, do you still get records?
If you're comparing dates, have you tried using the BF, OBF, AF, OAF (these are specific to date fields)?
Assuming I know what you're trying to accomplish, I might rewrite like this:
var text QUERY = "{9.TV.'" & UserToEmail([Person Assigned]) & "'}AND{3.XEX." & [Record ID#] & "}AND{11.OBF." & [End Date] & "}AND{10.OAF." & [Start Date] & "} AND{13.XEX.'Completed'}";
*edited: you'll need to convert user field to email, added screenshot for comparison