Fedora Hardware :: Acer Notebooks Fail Play Of CSS'ed DVD's?

HARDWARE: Two Acer Aspire 5251-1513 V120 based notebooks and one 5534-1086 dual-core Athlon; an MSI Wind U123, an HP G60-231WM dual core Athlon and an antiquated Compaq Presario (that I only keep around as it has RS-232, Parallel and PCMCIA ports).

OS Platform: F13 on MSI Wind, Fedora 14 on the others. All kept up with yum. All purportedly have proprietary codecs installed, including libdvdcss, installed thru the easyLife script. (NOTE: the HP has not had yum run recently)

SOFTWARE INVOLVED: Totem, VLC, Kaffeine, MPlayer, K9Copy. PROBLEM: Failure to play or backup legit (ie: purchased DVD's), which only happens on the Acer platforms -- the MSI, HP and Compaq work fine, as do the desktop (generic MSI based clones) systems here.

SYMPTOMS: Totem gives "cannot read resource;" VLC fails silently; K9Copy segfaults. All media players & copiers successfully play / copy previously decss'd files TROUBLESHOOTING ATTEMPTS: I've gone thru most of the threads here, looked at gst-inspect, made libdvdcss from source, copied libdvdcss from the HP (working x86_64 machine) to an Acer, built libdvdcss from source. I've also checked the permissions of the /dev/devices, they're 777