We are constantly testing our software with the newest builds of OS X but in case of Mavericks there seems to be an issue we did not recognise.
After excessive testing in the last days we have made some modification and compiled Minco base on the Mavericks SDK. This seams to fix most of the problems like sporadic quitting.
Unfortunately there is still an issue which can slow down the Mac if you have lots of events in Calendar with an associated iCloud account. The problem is that Calendar is producing console warnings when an application access the CalendarStore API. This is not only a Minco related problem. User reported us that they are getting the issue with Bento and other applications too. I already filled a bug at Apple and hope that they will find a solution with the next release.
We have considered and started to exchange the current CalendarStore API with the new EventKit but this turned out to become an extensive change of code and will break support for older OS X versions too.
If ever you are affected from an issue using Mavericks please let us know that we can provide you help and access to a modified version.
Apple confirmed the Mavericks console messages problem. There was already an open ticket concerning the issue and they are working on.
Finally, and with the help from our user we where able to release Minco 1.5 wich improves the compatibility to Mavericks.
If you will have still problems with version 1.5 we suggest to check the OS X Privacy settings if Minco is enabled for Calendar and Reminders access.
If ever Minco is not visible you can reset the privacy settings in the Terminal:
tccutil reset Calendar
tccutil reset Reminders
When you start Minco you will be asked if you agree that Minco access your Reminders and Calendar.