JCal Pro® MVC for Joomla 1.5 took a big step forward in the last few days as we released version 1.5.9 (build 383 and then build 384).
Together, these back-to-back releases contain fixes for what appear to be the last major bugs in the new Joomla 1.5-native codebase. These bugs deal with time zone managment for event display on the calendar as well as event submission/edition/deletion permissions on non-english sites as well as english-only sites running on PHP4.
While these issues are not security related, we recommend that all users upgrade to the most recent build. We are hoping to squash any remaining bugs in the next few weeks so the codebase can be stabilized.