I've have a plain vanilla Asterisk 13.3.2 installation (no freepbx) and just installed fop2 2.31.
Note: I am not using mysql for either, if that matters.

I created a basic buttons.cfg with only Extension and Queue buttons defined. The extension buttons work as expected. The queue buttons do show waiting calls, but they are not listing the queue members. (This worked fine for me on earlier versions of Asterisk with earlier versions of fop2, so I am familiar with what it should look like).

Here is an example of output from a "queue show", which does show the members:

Trouble-Phones-EAST has 3 calls (max unlimited) in 'rrmemory' strategy (545s holdtime, 288s talktime), W:0, C:33, A:2, SL:57.6% within 600s
   Members:
      "Clerk 14" <> (sip/1014 from sip/1014) (ringinuse disabled) (dynamic) (paused) (Not in use) has taken 6 calls (last was 1199 secs ago)
      "Clerk 21" <> (sip/1021 from sip/1021) (ringinuse disabled) (dynamic) (paused) (Not in use) has taken no calls yet
      "Clerk 15" <> (sip/1015 from sip/1015) (ringinuse disabled) (dynamic) (paused) (Not in use) has taken 22 calls (last was 1197 secs ago)
      "Clerk 13" <> (sip/1013 from sip/1013) (ringinuse disabled) (dynamic) (paused) (Not in use) has taken no calls yet
   Callers:
      1. SIP/2093-0000166b (wait: 31:40, prio: 0)
      2. SIP/2092-0000178d (wait: 19:51, prio: 0)
      3. SIP/2091-00001793 (wait: 19:46, prio: 0)

Here is an example of those user's definitions from my sip.conf:

[1013](softphone)
username=1013
callerid="Clerk 13"
context=default

[1014](softphone)
username=1014
callerid="Clerk 14"
context=default

[1015](softphone)
username=1015
callerid="Clerk 15"
context=default

And here is an example of the queue definition in buttons.cfg:

[QUEUE/Trouble-Phones-EAST]
type=queue
extension=3004
context=default
label=Trouble EAST

I've tried to keep both the Asterisk and FOP installations very basic and simple, so I'm not sure where I've gone wrong.
Any ideas of what I can do or check?

I tried another system running Asterisk 13.8 and have the same issue when trying both FOP2 2.30.06 and 2.31.00.
Is this a bug or am I doing something wrong?
I can try and get an Asterisk 12 installation together as a test just to see if it is isolated to Asterisk 13 or not.

I made the sip.conf by hand and did leave off the extension after the name. I just changed it to get rid of the quotes, space and add the extension as follows:

[1002](softphone)
username=1002
callerid=Clerk02 <1002>
context=default

One thing I noticed after restarting Asterisk is that the new CallerID's weren't taking effect! It seems that was due to me having PersistentMembers=yes in queues.conf, which I just changed to no and restarted again. Now the caller ID's are correct in queue show:

CLI> queue show
IN-Lanes has 0 calls (max unlimited) in 'rrmemory' strategy (0s holdtime, 0s talktime), W:0, C:0, A:0, SL:0.0% within 600s
   Members:
      "Clerk02" <1002> (sip/1002 from sip/1002) (ringinuse disabled) (dynamic) (Not in use) has taken no calls yet
   No Callers

But they unfortunately still don't show up in the queue buttons in FOP - they still say Agents: 0 and don't list the actual members.

I feel like we are getting closer, though. I'll keep tinkering...

Oh. That's interesting. The callerid in sip.conf is the only place I used the name "Clerk" ever. The members are adding and removing themselves from their softphone client. The only identifying information they provide in the softphone is server IP, SIP username/ password and AMI manager username/password. The softphone list the queues and they tick the boxes next to the queues they want.

To help remove the softphone from the equation, I just tried adding a queue member from the Asterisk console using

*CLI> queue add member sip/1002 to IN-Lanes

When I do that, the member does look a little different in the console, but still no change on the button itself:

CLI> queue show
IN-Lanes has 0 calls (max unlimited) in 'rrmemory' strategy (0s holdtime, 0s talktime), W:0, C:0, A:0, SL:0.0% within 600s
   Members:
      sip/1002 (ringinuse disabled) (dynamic) (Not in use) has taken no calls yet
   No Callers

If I do the above while running FOP2 in debug mode, I get the following output:

127.0.0.1            <- Event: DeviceStateChange
127.0.0.1            <- Privilege: call,all
127.0.0.1            <- Device: Queue:IN-Lanes_pause_sip/1002
127.0.0.1            <- State: INUSE

127.0.0.1            <- Event: QueueMemberAdded
127.0.0.1            <- Privilege: agent,all
127.0.0.1            <- Ringinuse: 0
127.0.0.1            <- Penalty: 0
127.0.0.1            <- StateInterface: sip/1002
127.0.0.1            <- PausedReason:
127.0.0.1            <- Queue: IN-Lanes
127.0.0.1            <- MemberName: "Clerk02" <1002>
127.0.0.1            <- Interface: sip/1002
127.0.0.1            <- Membership: dynamic
127.0.0.1            <- CallsTaken: 0
127.0.0.1            <- InCall: 0
127.0.0.1            <- LastCall: 0
127.0.0.1            <- Status: 1
127.0.0.1            <- Paused: 1

Use of uninitialized value in hash element at script/fop2_server.pl line 10115.

Does that last line perhaps help narrow down this issue at all?

Ah, you've got it!
If I do "queue add member SIP/1002 to In-Lanes"

In-Lanes has 0 calls (max unlimited) in 'rrmemory' strategy (0s holdtime, 0s talktime), W:0, C:0, A:0, SL:0.0% within 600s
   Members:
      SIP/1001 (ringinuse disabled) (dynamic) (Unavailable) has taken no calls yet
   No Callers

No quotes - and it DOES show up in the Queue button as "Clerk02" (the callerid).
Oddly, the "as" at the end of the queue add member line is not working at all - it rejects the command. No matter though.

So I either need to figure out how to ditch the quotes or get that patched version from you. I'm not sure what is adding them, though, since I took them out of the callerid string entirely, and the phone app doesn't specify it anywhere in its config (but maybe it is reading it from Asterisk's callerid and adding the quotes before sending the AMI command).

On a side note, I do have an older system elsewhere running Asterisk 1.8.7 with FOP2 2.26 where the queue buttons work fine even though it also has quotes in the member names.

Thanks for all your help thus far!!! I'll try and find you in live chat.

I have the same problem also..

When i have upgrade the latest version all queue members not shown like before ..
please help me..