I have a meeting request from a colleague which keeps reappearing in my ical even though I have declined it and deleted it several times. How can I delete this for good or is something else going on here?
Try each of the following steps until the issue is resolved. Back up all data before making any changes.
Create a new calendar. Move the unwanted event(s) into it, then delete the new calendar.
If the calendar server has a website, like iCloud or Google, log in to the website and delete the event.
Quit Calendar. Triple-click anywhere in the line below on this page to select it:
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
Follow the instructions in this support article, then log out, log back in, and test.
Boot into Recovery. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. A Terminal window will open.
In the Terminal window, type this:
Press the tab key. The partial command you typed will automatically be completed to this:
Press return. A Reset Password window will open. You’re not going to reset a password.
Select your boot volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
from the menu bar.
Retrieving data ...