After upgrading to 2.31.09, I can no longer login to the Fop2 Manager page. I am using the default creds of fop2admin/fop2admin, but when I try them now, I get an "Invalid Credentials" error on screen.
Everything otherwise seemed to go smoothly and I didn't notice the problem at first, but now I've done it on 3 systems (two coming from 2.31.08 and one was 2.31.04 I believe), and it's the same on each of them.
I am not using FreePBX and my /var/www/html/fop2/admin/config.php was and still is set as follows:

<?php
// If FreePBX is installed, use its database auth system by default
// To set up usernames and passwords
define('USE_FREEPBX_AUTH',false);

// User/Pass to Log into FOP2Manager. If we detect a FreePBX session
// or a fop2 sessions with the "manager" permission, the authentication
// will be asumed as ok.

$ADMINUSER = "fop2admin";
$ADMINPWD  = "fop2admin";

Any ideas for me?

OK, thanks. It does appear to be pretty random so far, so I'll try and keep an eye out for odd events.

As always, thanks!

I am using FOP2 2.31.06 against Asterisk 13. It is working great, but I notice that after running for a while, certain queue members show a time counter in the queue button, as shown in the below screenshot. These times don't match up to actual call times and I don't know where they are coming from. They aren't really harmful, but they are erratic and didn't use to show up on [much] earlier versions.

Any ideas what might be causing it or what I can check?

So I am using FOP 2.31.06 and and have created several queue groups with custom names for each. These work great, but I am left with a residual empty "Queues" group as well. There is no reference to a group called "Queues" and all queues do have a custom group specified.

Is there a way to remove this?

This is a really nice feature. Thanks again.

I see the following in the 2.21.02 release notes...

Fri Jun 10 20:19:55 2016 -0300 
Add support for grouping queues in FOP2 server, client and manager

So does this mean 2.31.02 can now group Queues buttons like it can for Extension buttons?

Is similar functionality available for Queue buttons? I tried specifying a group for them, but no luck.

That's exactly what I was looking for. Works like a charm.
Thank you.

What about by editing the buttons.cfg file directly? Is there a way?
The buttons tab doesn't show in the admin panel doesn't show me anything. Not sure why. Maybe because I am not using mysql?