IBM Connections 5: NextGen theme not displayed

After installation of IBM Connections 5.0 the new look & feel (NextGen UI) is not displayed. The UI still looks like the old 4.5 theme. In addition you find the following error in the SystemOut.log

[codesyntax lang="text"]

net.jazz.ajax.internal.util.TraceSupport error A dependency on "com.ibm.lconn.core.styles.oneui3/gen4Theme/package3RTL.css.css" could not be resolved.

[/codesyntax]

The reason seems to be some stale data in the WAS temp directory. To solve the issue, shutdown the Connections servers and delete the content from the following directory:

{WAS Install Dir}/AppServer/profiles/AppSrv1/temp/{nodeName}

Then restart the servers again. The theme should now be displayed correctly.