Time for an example.
I've recently been trying to utilize Oracle's ESM (Enterprise Security Manager), since the system it's intended for requires batch actions I used the command line tool. Guess what, when I use one of the commands the GUI stops showing associated roles for the related Enterprise Role, since it was obviously a coding bug, I've logged an SR thinking to myself that this bug, if reproducible (and it is) means no one have ever tested this functionality. About a month later I was notified that a fix was created and they're testing it. Two days later - bad news, the fix did not pass testing. And this is actually the current status (a few months have passed by now).
Last week I got tired of this whole thing so I've started digging for the source of the problem. Apparently, when you use the command line, the record generated in the OID has a case mistake. So my next move was to de-compile Oracle's code and fix it, and voila, it works!
When I told the support analyst about my fix, he said he knows the solution is easy but the problem is that they have some incompatibility issue with different database versions. I really don't care if it's reasonable for such a small fix to be taking such a long time to implement, I'm just happy I know how to dig.