The Usual Suspect
The usual problem has cropped up - line endings. A new version will be posted shortly. There also seems to be a problem with the version of Vimball which ships with the Windows version of Vim. Those viewing the file will have some nice folds to aid navigation around the file; unfortunately, under *nix the fold markers get added to the file name. Not very useful.
An interesting point made in the comments:
Your latest vimball has DOS line endings, and svn is still at the last version :(
The reason SVN is the last version is that bzr-svn was not able to push the latest changes up to Google Code. Now I'd like to point out that this is most likely my fault; I noticed that the author of bzr-svn linked to one of my posts about how the plugin didn't work under Windows. Just to clarify - this was due to my lack of effort more than anything else.
I've also enjoyed using bzr and so I'm considering moving to a bzr hosting environment. I'm going to investigate Launchpad but I'd welcome any other suggestions.