Although nothing about this was listed in the release notes, the bugs I had with deferred rendering, are now gone with v1.26.2.4.
Previously deferred rendering looked VERY odd for me, everything looked warped and flattened. Also trying deferred rendering with a window-size >2048 pixel resulted in an immediate viewer crash.
Works totally fine now.
I'm guessing the uninstall/reinstall for v1.26.2.4 removed some outdated stuff that was actually causing my problems. So if I had done a complete reinstall earlier it may have worked even back then.
Now the only thing left on my personal wish-list are multiple tattoo-/clothing-layers. Just ran into an occasion yesterday where I would have needed multiple tattoo-layers to combine things I bought. I'm sure that feature will come at some point. I know you are currently focusing on getting mesh-upload working first.
Thanks for the good work!