Can't access module settings (Devel module) I have a module that's enabled and working, but the configuration options won't show.

The module in this case is Devel, which I've used on other sites with no problem.  In this site, whenever I click on 'configure' in the Devel module listing, it takes me to the configuration page, but without a Devel option. 

I've cleared the cache and re-enabled multiple times. The module is definitely enabled because I can use functions like ddebug_backtrace().  

What else can I try?

EDIT:

I've uninstalled and re-installed the module, and still have no luck. I need an advice on how to trouble-shoot this.
I Think I figured out the culprit, if not the exact reason- I was getting “Allowed memory size” errors on common tasks like enabling modules, and once I remedied that my config screen showed up.  

The memory error issue was addressed here.