Why do comments sometimes get deleted from this website?

The purpose of comments is to add further information which will help other people. They're not there to ask support questions. Such support questions will get deleted by the web admins every few days.

If you need support, use the mailing list.
There's a big link at the top of each page named "Get Help". You can find all the information you need there, including how to reach the mailing list for questions not answered in the FAQ or the documentation.