Earlier in my blog I posted a work around to the iCal 5.0 issue of not being able to add attachments when setting up a new event. After a visit to the apple store for another product (Apple TV) I had a thought just before walking out the store. With my MBP in hand I showed, explained rationalized the issue to two (2) Apple Store employees. About an hour later we figured it out together. Long story short... you need to make sure when you create the new event that you do so on one of your "On My Mac" calenders and the option to add an attachment will be there. I had my default calendar set to my mobile me calendar. So i quickly took this one step further and jumped to iCal preferences and set my Home "On my Mac" calendar to the default. Presto! Fixed...Resolved... Solution. No need for the work around now. Thanks for reading. Hope it helped.
Video Tutorials on my youtube channel and blog.
Work Around alternative: http://http://www.retiredarmyranger.com/2011/09/ical-50-lion-os-mac-cant-add-att achment.html
The Real Solution: http://www.retiredarmyranger.com/2011/10/cant-add-attachment-in-ical-50-lion-os. html
RetiredArmyRanger