PDF Invoice and Packaging Slips, totally blank/white files

Hello,
I have been running into some problems since the latest WP and Jigoshop updates.

No matter if I click on newer or older orders, the generated PDF (invoces and packaging slips) is a totally white / blank paper.

It has been two weeks from the first time I had this issue and no patches have been released, what I should do or check?

System Information:
### Begin System Info ###

Multi-site: No

SITE_URL: https://www.hierbaverde.com
HOME_URL: https://www.hierbaverde.com

Jigoshop Version: 1.12.1
WordPress Version: 4.0

Platform: Windows
Browser Name: Firefox
Browser Version: 32.0
User Agent String: Mozilla/5.0 (Windows NT 6.3; WOW
64; rv:32.0) Gecko/20100101 Fire
fox/32.0 AlexaToolbar/alxf-2.21

PHP Version: 5.5.16
MySQL Version: 5.1.73
Web Server Info: Apache

eAccelerator: Disabled
APC: Disabled
OpCache: Disabled

PHP Memory Limit: 256M
PHP Post Max Size: 8MB
PHP Upload Max File Size: 40MB
PHP Max Input Time: -1
PHP Max Input Vars: 5000
WordPress Memory Limit: 256MB

Short Open Tag: Enabled
Allow URL fopen: Enabled

WP_DEBUG: Disabled
WP Table Prefix: Length: 15 Status: Acceptable

Show On Front: page
Page On Front: 203
Page For Posts: 103

Session: Enabled
Session Name: PHPSESSID
Cookie Path: /
Save Path: /tmp
Use Cookies: On
Use Only Cookies: On

DISPLAY ERRORS: N/A
FSOCKOPEN: Supported

ACTIVE PLUGINS:

Acunetix WP Security: 4.0.4
Akismet: 3.0.2
Asesor de Cookies: 0.18
ClickDesk Live Chat, Help Desk & Voice Chat: 4.3
Comments Evolved for WordPress: 1.5.6
Contact Form 7: 4.0.1
Google AdWords Remarketing: 1.0
Jigoshop: 1.12.1
Jigoshop Category Pages: 1.3.1
Jigoshop PDF Invoices: 2.5.2
Jigoshop Specific Country States Delivery: 1.2
Jigoshop Table Rate Shipping: 3.3.1
MailPoet Jigoshop Add-on: 1.0.4
MailPoet Newsletters: 2.6.11
Really Simple CAPTCHA: 1.8
Unattach and Re-attach Media Attachments: 1.2
UpdraftPlus – Backup/Restore: 1.9.26
W3 Total Cache: 0.9.4
WangGuard: 1.6-RC4
WangGuard – MailPoet Conector.: 1.0.0
WordPress SEO: 1.6.3
WP Admin Bar Removal: 2014.0816.0392
WP Smush.it: 1.6.5.4
zM Ajax Login & Register: 1.0.8

CURRENT THEME:
:
### End System Info ###

Thanks in advance for your help.

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