solved, was "https everywhere" the one causing the problem.

yes, it works.

Adobe Flash Player
Versione: 18.0.0.232
Shockwave Flash 18.0 r0
Posizione:
C:\Windows\SysWOW64\Macromed\Flash\pepflashplayer32_18_0_0_232.dll
Tipo:
PPAPI (out-of-process)

Disattiva
Tipo MIME Descrizione Estensioni associate
application/x-shockwave-flash
Shockwave Flash
.swf
application/futuresplash
FutureSplash Player
.spl

for me the second option do not work, I've already reinstalled flash player, but no result

http://www.coopfirenze.it/punti-vendita/pisa-cisanello scroll down:
OFFERTE IN CORSO
Prendinota Extra 18
Offerta valida dal 20/08/2015 al 02/09/2015 nei Superstore e Grandi Superstore Unicoop Firenze

Scarica PDF (2 MB) Consulta online

Also doesn't work in those pages:

http://www.conad.it/conad/home/global/cooperative/conadtirreno/promozioni/2015/SS_TO_AV_20_AGO.html

http://www.conad.it/conad/home/global/cooperative/conadtirreno/promozioni/2015/CN_TO_20AGO.html

For a couple of weeks it is impossible to load some flash player pages

==================
DEBUG

CONFIG

Time: Tue Aug 18 17:15:41 GMT+0200 2015
OS: Windows 7
Manufacturer: Google Pepper
ScreenSize: 1366x768
ScreenColor: color
Memory: 106.97Mb
Sandbox: remote
UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.26 Safari/537.36 OPR/32.0.1948.4 (Edition beta)
Language: it
Player: PlugIn
Version: WIN 18,0,0,232
Debugger: false
URL: http://v.calameo.com/?bkcode=0025435433dc870599a0b&view=book&mode=viewer&wmode=opaque

CONTEXT

page: 1
pagefxopacity: 50
pagefxopacityonzoom: 0
language: it
wmode: opaque
langid: it
loaderversion: 10
viewerversion: 0
mode: viewer
jsapienabled: false
bkcode: 0025435433dc870599a0b
view: book
trackersource: embed
clicktarget: _self
autoflip: 0
allowminiskin: false
showsharemenu: true
zoomMax: 300
viewBorder: 48
mini: false
volume: 75
QueryString: &page=1&pagefxopacity=50&pagefxopacityonzoom=0&language=it&wmode=opaque&langid=it&loaderversion=10&viewerversion=0&mode=viewer&jsapienabled=false&bkcode=0025435433dc870599a0b&view=book&trackersource=embed&clicktarget=_self&autoflip=0&allowminiskin=false&showsharemenu=true&zoomMax=300&viewBorder=48&mini=false&volume=75

LOG

ERROR: Unable to load http://d.calameo.com/3.0.0/book.php?bkcode=0025435433dc870599a0b&callback=_jsonBook
ERROR: Unable to load http://d.calameo.com/3.0.0/book.php?bkcode=0025435433dc870599a0b&callback=_jsonBook
ERROR: Unable to load http://data.calameo.com/3.0.0/book.php?bkcode=0025435433dc870599a0b&callback=_jsonBook
FATAL ERROR #910: Unable to load publication