CKEditor is not easy to set up correctly. It actually took me a while to figure it out.
After trying to help out in a number of threads where people struggling with this beast, I thought it was a good idea to collect all the bits and pieces scattered around and have a sort of canonical question that people could be referred to when they had this problem.
There would be a list with the "standard" answers, and if none of them solved the problem, people could add their own. I was under the impression that on SE, this sort of thing was called a "community wiki", and that it was an accepted practice here.
Here is the pair: How do I debug a CKEditor installation on Drupal 7?
To make my intentions clear (i.e. that this was intented as a community wiki), I added the following paragraph at the end:
If none of the answers given to this question helps you, please edit this question and add details about what you've tried so far to solve your problem, and any details you can offer about your configuration. You can add information under the line below. (AFIK, there is no longer possible to create a community wiki question, but this question will enter the community wiki when it has been edited by at least 5 different users, this is intended.)
However, the part of the text quoted above was promptly deleted by one of the diamod mods, with a note that:
nobody should edit somebody else's question to add details for their own case
To me, it is important to encourage users to edit the question. Here's why:
When trying to help out, my attempts to answer usually resulted in a "didn't work" response, but this also prompted the OP to add more detail to the question. That additional detail allowed me (after a few rounds) to reproduce their problem at my test site and hence propose a solution.
Most of these users seemed to be pretty inexperienced (nothing bad about that - we all were there at one time), and would not be able to improve anything by editing the answer. It was the additional detail added to the questions by the user with the problem that allowed me to improve the answer.
By setting up the wiki the way I did, and in particular by explicitly encouraging users that didn't have their problem solved by the present answers to add new detail to the question (which then would be removed again after a solution found and the case added to the list of solutions), the wiki would evolve.
I've of course nothing against anyone adding stuff directly to the answer (that is in the nature of wikis), but I believe that without getting fresh problem reports form those with problem, this will be a static affair with little chance of catching new problems and solving those.
I won't add any encouragement to add new problem cases to the question before I get a clear OK from the mods here on meta that it's OK (i.e. I won't start an edit war) - but if I think the wiki would work better if user's were encouraged to add details about new problems they experience to the question.