blcg_window Blank

[rvaquerizo117]

Hi,

I just installed it in magento 1.9.3 in php 5.6.

When I use grid options it shows blank blcg_window:

https://i.imgur.com/cf6IKbi.png

system.log:

2018-02-17T10:25:02+00:00 ERR (3): Warning: strpos(): Empty needle in /home/locasc/public_html/lib/Zend/Controller/Request/Http.php on line 508
2018-02-17T10:25:02+00:00 ERR (3): Warning: strpos(): Empty needle in /home/locasc/public_html/lib/Zend/Controller/Request/Http.php on line 514
2018-02-17T10:25:44+00:00 DEBUG (7): HEADERS ALREADY SENT:

[0] /home/locasc/public_html/app/code/core/Mage/Core/Controller/Response/Http.php:52

[1] /home/locasc/public_html/lib/Zend/Controller/Response/Abstract.php:768

[2] /home/locasc/public_html/app/code/core/Mage/Core/Controller/Response/Http.php:84

[3] /home/locasc/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php:184

[4] /home/locasc/public_html/app/code/core/Mage/Core/Model/App.php:365

[5] /home/locasc/public_html/app/Mage.php:684

[6] /home/locasc/public_html/index.php:83

Any idea please?
Thank you!