If you're having a problem with the forums, at the minimum, include in a message:
1. Time and date when the error first occured
2. Specific topic where the error occured
3. Browser type
4. If you've used the search function (including the appropriate date range) to find it.
In the case of login and post display problems, a good place to start would be to reset your cookies using
this tool
The more specific you are, the better I ability to have to resolve the question/problem.