We have released 2.5.1 of DT Register and updated the package as of 11:15pm EST on May 1, 2009. Please download and update as a handful of issues were found in 2.5.0. Despite tons of testing, there is always SOMETHING else.
The fixes include various issues that were had by some users due to different server configurations mostly. Then for some, the migration from JEvents 1.4.x to 1.5 was not smooth as the eventids were changed, therefore killing the connection of those existing events with DT Register. We have now included a simple tool in the Event Management area to help you re-sync those events if this has happened to you. You do still need to have the old JEvents com_events table in place.
Thanks all for helping us to quickly find and fix any issues!