Thanks to Calkulin, Dougpiston, and bwthor20 for this fix. It was too late for me, but hopefully not for you. My situation was, after flashing a rom, I was suddenly S-On without recovery. DO NOT FLASH THE RUU!!!!! Just follow this guide and you'll be good:
Thanks bwthor20 for telling me about this guide:
Now, go to the incredible version of this guide, thanks to Dougpiston:
These guides should get you fixed!