No dude, you're not alone ... other posts also reported this problem (among others)
I have it too and my test site is on a fresh Joomla 1.5.22 site with only DTR 2.7.0c installed (no upgrade from previous version)
Aaaaaaaaaaaaaaaaaah Im going crazy .... I got several emplyes that use this function every day, and also 3-4 telemarketers that registers people in DTR... Its kind of hard for me to explain when things are going to be normal again
Nathan , you can do this! Keep fighting ! When this version is finished and with no bugs, it will be the BEST application on Joomla! ever !