I was getting curious yesterday and decided to check some of the settings in LAV Splitter while a video was playing. Although I was running MC 17.092, the file version in the bottom right of the LAV splitter screen after I opened it from the playback window read 0.42. Sure enough when I looked at the currently-installed version on my HTPC (I used to manually install the filters before RO) I had 0.42 installed. I manually reinstalled LAV filters with 0.47, and next time I checked the splitter settings through MC, I was using 0.47.
It looks like the manually-installed LAV filters take precedence over the internal RO LAV filters? I also feared that madVR was not being used internally (I couldn't find a way to check the current version) so I reinstalled with the latest version. This could be construed as a feature but it also explains why I usually have to manually set subtitles for each movie I watch (RO is not able to auto-configure). I unfortunately need the filters installed system-wide because I create molecular dynamics simulation videos in Powerpoint for presentations, and the MS filters aren't up to the task w/o HA.