Description
For designs that were created in versions 6.1 or earlier, Altera® recommends opening the design in SOPC Builder classic mode, then opening it in SOPC Builder version 7.1 or above.
To enable classic mode in SOPC Builder version 7.1, create an environment variable named SOPC_BUILDER_PREVIEW and set the value to 0.
Refer to the following solution for more information: http://www.altera.com/support/kdb/solutions/rd05082007_870.html