Freepbx 12, Asterisk 12, Ubuntu 14.04, FOP 2.28 (I previously typed 2.27... it is 2.28)
(Incredible PBX 12 with Asterisk 12 and FreePBX) as per http://nerdvittles.com/?p=11041

I just get:
server/fop2_server --test
Flash Operator Panel 2 - Valid License (1)
Could not write configuration data /var/www/fop2/fop2-variablesGENERAL.txt.
Check your file permissions

I used debian64 package.
Fop Manager did not install, and the neither did the MySQL tables. I have manually done both now, but still same issue.

Couple of other screen captures
root@swindon:/usr/src/fop2# /etc/init.d/fop2 start
Starting Flash Operator Panel 2: fop2.
root@swindon:/usr/src/fop2#

root@swindon:/usr/src/fop2# /etc/init.d/fop2 stop
Stopping Flash Operator Panel 2: fop2start-stop-daemon: warning: failed to kill 27118: No such process
1 pids were not killed
No process in pidfile '/var/run/fop2.pid' found running; none killed.

manager.conf

[general]
enabled = yes
port = 5038
bindaddr = 0.0.0.0 *(have also tried 127.0.0.1)
*displayconnects=no ;only effects 1.6+

[fop2]
secret = fop222
deny = 0.0.0.0/0.0.0.0
permit = 127.0.0.1/255.255.255.0
read = all
write = all
writetimeout = 1000
eventfilter=!Event: RTCP*
eventfilter=!Event: VarSet
eventfilter=!Event: Cdr
eventfilter=!Event: ExtensionStatus
eventfilter=!Event: ChannelUpdate

fop2.cfg

[general]
; AMI definitions
manager_host = 127.0.0.1
manager_port = 5038
manager_user = fop2
manager_secret = fop222
;event_mask=agent,call,command,system,user,dialplan

Any help, will be much appreciated.