Okay, this phone just won't work with CWM at all. I followed those directions exactly. Rom Manager would not boot to recovery, only to a regular phone reboot. Quick Boot will boot the phone to regular phone recovery, but not CWM recovery. I go into Bootstrap and tap "bootstrap Recovery" and it says success. I hit "reboot recovery" and it boots into recovery, but has the same problem as before. Selecting any item and pushing the power button to execute leads to a blank screen. Hitting power again brings back the recovery menu screen. I have root, but I can't even make a Nandroid backup (or restore one, or flash a zip file, or even reboot) because I don't have CWM recovery.
I accidentally bought two DXs on Ebay, so I'll be interested to try this process on the other and see what the result is. I may have to give up on flashing any alternative rom, but just be satisfied to have TiBu functional.
Thanks again for your help.