When I click on WYSIWYG editor image insert button it is only showing a blank page. Below screen shot is for reference.
2 Answers
This is likely due to your host applying a Web Application Firewall which is blocking it from displaying.
The issue is caused because you will need to apply the 5344 patch available here:
https://www.magentocommerce.com/products/downloads/magento/
Once patched your image browser should then display correctly.
Also, it's worth checking that your browser/system has flash installed as this is still (unfortunately) used in the image browser.
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Check my edit, it may be just an issue with flash. Do you have Flash installed and working correctly in your browser? May 11, 2015 at 10:55
If anyone is having a similar issue, I believe that the reason was because I had x-frame-options: DENY however, Magento needs X-Frame-Options: SAMEORIGIN in order to allow the frame to populate. God bless you!