Source view is showing ` at the start of a file (BB-1156)

The files in my repository in source view are showing ` as the start character, and all tabbing has been removed.

These files are UTF8 with a BOM as far as I know and the raw versions look fine - here's an example:

http://hg.shrinkrays.net/spruce/src/0d00e3c15e2c/Models/WorkItemManager.cs