Just installed the latest release today, and recompiled a program using this. Component version is 126.96.36.199, Component Pack 188.8.131.52
After clicking on the drop down calendar, or manually entering the date in the edit box, it reverts to the date set in the TFormOnShow event (now -1)
It no longer allows ANY change.
Uninstalled 184.108.40.206 and reinstalled 220.127.116.11. The TAdvDateTimePicker is fully functional again, with NO program changes.
Thanks for reporting. We fixed this regression and we'll release an update as soon as possible with this fix.