Mark, of concern to me first is the below because a change was made to vframe.C in December. Ignoring vdpau for me for now, did the November tarball work?

VFrame::allocate_data 518 could not attach shared memory, 930x523 (model 6) shmid=0x00000000
shmall = 18446744073692774399
shmmax = 18446744073692774399
shmmni = 4096
shmused = 50173032 (6 items)
shmother = 4870728 (8 items)
Mutex::lock: Success
Mutex::unlock: Invalid argument