Recently i upgraded to 1.9 and had some problems.
Many are fixed already, with help from the forum (thnxs)
But i found another and can't find a solution online or in the forum.
Normaly there are 3 store views in the backend, but after the upgrade the whole view is empty.
( i'm working in a duch version of magento, but its under System - stores (beheer winkel).
When i go there it is completly empty...
Hope someone can help!
Try refreshing the cache and reindexing the Magento. Also try to run compilation and then open this.
If you still finding the same error then see into the system.log file or exception.log file for error and fix it.