'Media File Selector' blank screen To use already existing image, I choose 'Media File Selector' Widget.
But, it gives me blank page like this when I click on 'Library' to choose already existing image in Drupal-7.



Version of the Media:
1) Media: YouTube
(media_youtube) 7.x-2.0-rc4

2) Media
(media) 7.x-1.4

In Media browser settings, Allowed file extensions are 
(jpg jpeg gif png txt doc docx xls xlsx pdf ppt pptx pps ppsx odt ods odp mp3 mov m4v mp4 mpeg avi ogg oga ogv wmv ico)

Thanks!
I am not sure whether to making 'jQuery' version down to some level is good or not. But, I tried to downgrade the jquery version to 1.5 and it works well with my website.

I refereed this post:
Media 7.x-1 Library tab empty

Now, I can see all my images by selecting 'jQuery' version - 1.5.

To do so:
Go to 
Home » Administration » Configuration » Development



Thanks!

Vidushi