OMG you saved my transformer!!!
Long story short, my tablet, as of 20mins ago, was in such an awkward status:
- has su and superuser.apk in /system/xbin
- all root checker apps say I'm NOT rooted
- on stock recovery but stock images put on external SD card won't get recognized
- whenever an app requests root, it got automatically denied by SuperUser.
and I saw this post....I'm back on 9.2.17 stock now!!
Thanks a million! ln -s...genius!!