Since upgrading to 2.11, the calendars I set up previously are not selectable in tasks, when I either create a new task, or edit an existing one.
If creating a new one, it comes up with the 4 calendars I've created but when I deselect some of them, the deselection does not work.
When editing, whichever calendar the task had before, cannot now be changed.
For now as a workaround I've gone back to 2.10, though I MUCH prefer the preferences/options interface in 2.11, as well as having the menu bar icon.
I'm using Rainlendar Lite under Mac OS X 10.6.8 (Snow Leopard)
Thanks for your help!