Well, it seems to be an XML or StreamedMP issue. I copied the old DB - same result. Switched to Titan skin - MVCentral worked. Switched back to StreamedMP - no good. Re-ran the install file and chose repair - no good, same blank page.suspect xml problem (skin)
if setup of streamed does not work, push all of mvcentral xml back from predecessor (mp) version. (if you still have)
test times in titan skin
then you know exactly whether database / dll or skin