hardyjohnson/CodeIgniter — comment on commit b8f4da50ee2719aedf78eb811dea86475372b154
File:  line 0
By hardyjohnson:

Note this bug manifests itself as getting the Disallowed Key Character message when trying to hit a page when you have browser cookies with hyphens in their keys. This is typical of some Wordpress sites. Bug is apparent back through at least CI 1.7.2 possibly further.