It looks like some of the the basic editor features such as the print margin and misc right margin indicators (search results, problems, etc.) have gone missing in 0.5x. They work fine in 0.4x and so we've reverted to the old version.
As trivial as these features are, we find them very important -- esp. the print margin. We enforce a 79 char line length and having a vertical line in the the editor is essential.
0.4x works pretty well for our needs and we're very happy, so please don't take this as a rant :-)...just some feedback from your users.
Thanks for the note. It was an easy fix, made it to 0.6.