Simple System.debug not working

Question

I'm not able to see any System.debug(); calls from my Apex class in my debug logs, which is being called via JavaScript Remoting in a Visualforce page.

Client Portal APEX Controller (@RemoteAction method is the one I'm calling with the debug statement):

public class ClientPortalHomeController {
    public Contact contact {get; private set;}

    public ClientPortalHomeController() {
        contact = [
            Select Id, FirstName, LastName, Birthdate
            From Contact
            Where Id In (Select ContactId From User Where Id = :UserInfo.getUserId())
        ];
    }

    @RemoteAction
    public static String UserIDLookup(String handle) {
        HttpRequest request = new HttpRequest();
        request.setEndpoint('https://jsonplaceholder.typicode.com/posts/1');
        request.setMethod('GET');

        Http http = new Http();
        HttpResponse response = http.send(request);
        System.debug(LoggingLevel.INFO , response);
        return response.getBody();
    }

}

Debug Logs page in Setup:

I even changed the APEX field to Debug as shown in this answer.

---

How it's being fired:

Visualforce.remoting.Manager.invokeAction('{!$RemoteAction.ClientPortalHomeController.UserIDLookup}',
    igHandle,
    function(json,event) {
        var res = $('<div/>').html(json).text();
        res = JSON.parse(res);
        console.log(res);
    }
)

---

Additional debug level screenshots:

Answer 1

I just tried with a @RemoteAction I had lying around in my developer org. I can't remember what the intention was, but it will serve for demo purposes.

Controller:

@RemoteAction
public static String saveVideo(String data) {
    System.debug(LoggingLevel.INFO,'saving ' + data);
    return JSON.serialize(data);
}

Visualforce Page:

<input type="button" value="Inject!" onclick="sendJson();"/> 

<div id="target" style="border: 1px solid grey; height: 50px;"></div>

<script type="text/javascript">

    function sendJson() {

        var inputJson = {key:'value4',key2:'value5'};       
       Visualforce.remoting.Manager.invokeAction('{!$RemoteAction.TestPageController.saveVideo}', JSON.stringify(inputJson) , function(result, event){
            if (event.status) {
                //Existing div
                document.getElementById('target').innerHTML = result;

            }
        },{escape: false});
    }
</script>

This produced a debug log with the VFRemoting Operation type.

Note that this log appeared in the older Debug Logs UI without having the developer console open.

I tried dropping the ApexCode level back to INFO and it still worked.

---

Things to try/check:

1. Are there any "Class and Trigger Trace Overrides" configured for ClientPortalHomeController. These would override any general logging levels.
2. Are you getting any logs from other actions, such as loading the Visualforce page?
3. Are you getting exceptions back from the Remote action due to an error in the callout - see Debugging JavaScript Remoting
4. Does the UserIDLookup static method work if you call it via anonymous Apex?
5. Double check that the Debug log expiration date is in the future.