Steps to reproduce:
1. Write a comment in an event sheet that uses TAB spaces
<img src="https://dl.dropboxusercontent.com/u/7765312/C2/Comment1.png" border="0" />
2. Upon clicking off, the comment doesn't display the tabbed space (though it is still there if you click back onto the comment)
<img src="https://dl.dropboxusercontent.com/u/7765312/C2/Comment2.png" border="0" />
Maybe I'm being nitpicky, but a bug's a bug. I did manage to confuse myself with some notes in a comment I had, I used tabbed space and ignored the fact it didn't actually display, but today got really confused at my notes til I clicked onto it.