Unable browse or see the history of any files with a '+' in the file path (in SVN external repo). Other characters could result in the same issue, but I've only noticed it with at '+'.
Diffs display correctly when viewing a commit containing files with a '+' in the path, but under the "Changes" section when viewing a commit, the history for said files show as blank, and both "browse" and "modified" links result in "path does not exist" and 404 errors respectively.