Thanks for your trust by providing me access to your site, again.
I discovered that your server is running IonCube Loader.
Although your version shouldn't give any problems, there are known issues with IonCube.
I'm not sure, the issue about we know and care about is already fixed in IonCube version 4.1 and yours is 4.0.10...so, it could be a problem).
The best thing what you can do is to contact your host and ask them what to do.
You even can follow these instructions over here (proceed at the bottom > Upgrading ionCube loaders on shared hosts):
I've already uploaded the necessary files and modified the needed php.ini's.
See folder /ioncube and these files /php.ini (Joomla root) and /administrator/php.ini
- unpack the attached zip
- upload all the files to /ioncube (except ioncube_loader_lin_5.3.so and loader-wizard.php)
Just start the IonCube Wizard, as it needs information that you only can provide:
Just follow the steps and hopefully it will help to fix your issue.
At this time I've no solid clue what's going on.
Because of the blank pages I also checked if your server is running Suhosin.
This isn't the case.
I can confirm because I've used the Suhosin method by modifying the custom php.ini's.
Also, blank pages usually means that there are php errors involved.
It's not clear to me where to look for because when I enabled System Debug it did show me nothing.
So, honestly I'm a little lost here.
Let us know how it goes after you have followed the steps provided.
May be there will be an answer.
I hope this helps.