I will need more details because:
I tried the viewer myself, against:
- Another instance of the same viewer.
- An instance of the Cool VL Viewer v1.26.22.52 (pre-BoM Universal)
- An instance of Singularity v1.8.7
- An instance of Firestorm v6.0.2
Each time, my avatars (in all viewer instances) rendered just fine, be them legacy avatars or rigged mesh ones... And this is
without any need to tweak the settings (friends and partly rendered avatars stuff).
As it is, I doubt
very much the issue you are seeing is related to BoM stuff: in particular, I see a
massive amount of warning messages about failed network transfers (both HTTP and UDP) in Firestorm's log... On the other hand, the Cool VL Viewer log shows the usual baking messages (with the reduced/legacy set of bakes), so it works as expected !
I am wondering, also, if your avatar outfit was properly worn (missing body part ?). Be aware that, by default, the Cool VL Viewer does not use the Current Outfit folder (COF) in OpenSIM: this may cause issues when you switch back and forth between the Cool VL Viewer and other viewers for the same avatar.