I've a problem on my production portal. A Web Dynpro Page is not showing anything anymore. The Web Dynpro is a Java Web Dynpro that is a welcome page with only a static text (i.e. no backend calls or other stuff, this application is as simple as you can get).
If I try to preview the page from Portal content, the loading wheel is shown for a second and then the page remains empty (i.e. blue). No errors or system messages are shown. I've even tried to preview the WDJ page from the Web Dynpro Application subtree and I get the same behaviour.
If I run the application from Content Administrator\Web dynpro, instead, the Web Dynpro is correctly loaded and the page is correctly shown. So the application and the DC are OK.
Since I've tried even the preview from the WDA subtree, that excludes that the content is not shown due to some end user personalizations.
Can someone help me to troubleshoot that? What can I try?
My portal is running on a Netweaver 7.1 installation.