It might also be software related. With my G61R, it will almost always display Cinema, but occasionally it will show PLII, and that only happens when playing OLD movies, so I assumed it was because the soundtrack hadn't been mastered to modern DD / DTS / HD-Audio standards.

If you've coincidentally only been playing old movies, that could be an answer. Stick in a modern blockbuster & see what you get.

Cinema: Meridian 271, 3 x DSP640 (behind screen), 4 x DSP320 (in-ceiling), 4 x DSP3100 (surrounds), 2 x AC12 (interface). 2 x Perlisten D12s subs, Lyngdorf MP40 processor. DT 145" 2.35 AT screen. Sony VW870 projector & S-T lens, Lumagen Radiance Pro.
Lounge: Roon, NUC, Kef LS50 Wireless + 2 x REL Gibraltar-2 subs

Meridian owner since 1998