This last emu again have old problem...After powervu and oscam need make full receiver restart for other cryption and other emulators, keys is actives but black screen...I forgot but one version have fix this problem
Are you compiling from source? From oscam-patched git or from oscam svn and manually applying the patch? What image are you running? I compile from oscam-patched git and running dreamelite 6 on dm900 and I don't have problems switching from des to csa channels.