Quote - I know this is an extremely hard bug to fix -

It is not. Once the bug is well defined it is very easy for whom made the code to fix it. There are two cases that makes very difficult to correct bugs. 1- The bug appear to happen at random and you cannot make the bug happen at your will. You tests, test, test and all is ok, you return it to the user and the bug happens again. 2- The police of the company. Many companies refuse to acknowledge that their product or service has something wrong. The user is always guilty. They turn the user around and around until he/she desist. The bug report and its details never reach the responsible for the code and is he/she that can fix. Even he is aware of what happened he is not allowed to fixed it because it would recognize that the company had a faulty product or service and it were sold hundreds or thousands of it.

Stupidity also evolves!