We do not, but version 2.7.7 is over 2 years old!! The current version for Joomla 1.5 is 2.7.25. You should update to that. We've seen no such reports or problems from other users.
Anyone out there using Apache 2.4 that can verify that all is well with the latest DT Register package?
We certainly do not support such an old version... and even the latest version for J1.5 is no longer in development. We've released a few bug fixes, but it probably will never be updated again at this point. The current package is massively improved though over the one you are using... and you would need to upgrade that first anyway prior to moving into the newer series of both DT Reg and Joomla.