After further testing, we have discovered some remaining issues in the new release of DT Register. These items have all been addressed now and can be implemented to your site by uninstalling, then reinstalling the new 2.1.2 version. This install includes one database adjustment, so you should do a new install, not just a manual file update.
We have thoroughly went through all payment and registration options and everything is working exactly as it should in all aspects. Thanks for your patience while we made these final adjustments.