I just upgraded to a new server so I could upgrade to the latest wordpress, then updated headspace too. Previously, my post title tags were
'[Headspace Page Title] - Custom Text'
Now, I get 'three odd special characters[headspace page title]' and nothing I fiddle with in the settings seems to fix it!
Here's an example post: http://www.therabbithouse.com/blog/2012/06/09/mini-rabbit-garden/