GET variable bug?

[eluser]ethixsystems[/eluser]
I am currently enabling GET variables by setting enable_query_strings to TRUE so we can pass GET variables using a class that we wrote outside of the CI framework. It all works with one exception - when I only pass a single GET variable, it comes back with a 404 error. (?a=1). However, when I have 2 or more, it works perfectly fine. (?a=1&b=2)

Does anyone know if this is a bug in CI? Or is there some sort of setting that is causing my issue? I'd rather not keep two versions of the class - one that works in CI and one for regular use.

Thanks.

Dan