I just upgraded a Sitecore site from version 6.5 to version 7.2.
The site has 1 CMS server and 2 CD servers with standard scalability configuration setting. The CMS server has 3 publishing targets (web_external01 -> CD1, web_external02 -> CD2, staging -> CMS / preview). Media items are stored in database.
After the upgrade, I cannot view the newly upload media items anymore from CD servers after publishing (images, pdfs,etc), but they are displaying properly on the web target.
Scenario :
upload a test.png under Media Library -> publish to 3 publishing targets -> browse to http://cms.xxxxx.com/~/media/test.png -> WORKS !
browse to http://xxxxx.com/~/media/test.png -> Sitecore Document Not found error
Accessing the existing media items (the items that are already exist before upgrade) works.
Anyone has idea what might cause this issue?