Okay... let's try this. You need to have the latest version of Black Plastic (2.191) and rootsh installed (if not, install it via app manager) and extras-devel repo enabled. Change your theme to nseries, then type these into terminal (make sure you type everything correctly and press enter after every command):

sudo gainroot
rm -rf /usr/share/themes/blackplastictheme-themedir
rm -rf /sbin/launchblack
rm -rf /sbin/setupblackplastic
rm -rf /opt/rx
rm -rf /home/user/.config/PlasticTheme
apt-get clean
apt-get update
apt-get install --reinstall black-plastic-theme

If any errors is shown, paste them here.

If no errors were shown, then go and select to use Black Plastic Theme and reboot. You should now have black plastic theme with Droid Fonts and Black color scheme in use. Then go to the settings -> Plastic Theme Settings, and try to set font into Nokia Sans, scheme to DeepRed, transitions into enabled mode and the activate -field as it is (keep my current theme active). Hit save -button and setup should start. Banners should be popping up durin setup telling you what's going on. Tell me if you don't see any banners. Finally when the setup is done and progress bar -window has disappeared, close the setup and reboot the phone.

You should now have DeepRed with Nokia Sans. Tell me if it's not working.

And final question: you have PR1.2 firmware on your phone, right?