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I've used ZDT for over a year now with no major issues. However, since last Thursday, I cannot add, change or delete appointments. I've gone as far as uninstalling and reinstalling ZDT to no avail. All existing appointments are still there, the reminders come up and everything, I just cant add any new ones. Please help.
Bugzilla
Wiki
Source
Calendar "Locked Up" 
Linear Mode
