The AVR should display either "DSD Direct" or "DSD Multi Direct" if the Oppo is bitstreaming the audio to the AVR to decode, or it will display "Mult CH IN" when the Oppo is decoding it. A setting likely got changed in the Oppo.
I have the 4311 and have played many SACDs with it. I've never seen "SACD" displayed on the 4311's display. I see DSD Direct or DSD Multi Direct if my 103 is set to DSD. If my 103 is set to PCM then I see Stereo/Direct or MultiCH on the 4311's display. I would say your memory is playing tricks on you .
To be honest I bounce back and forth between DSD and PCM. I was convinced that I could not hear a difference between DSD and PCM but at times I use the DSD setting. I only use DSD for stereo SACDs as no bass management is needed. When listening to multichannel SACDs I use PCM then the 4311 does bass management and Audyssey as well. So I would suggest trying both the DSD and PCM settings to see which you prefer.