There are quite a few differences between 8.5 and 9.0, so I suggest keeping them separate. If you have a problem related to 9.0, ask it in the 9.0 forum, even if it may also be a problem in 8.5.
We already have people writing in the 8.0 or 8.5 forum, asking questions, but then admitting that they are using 6.5, and the solution they get is not working in that version. We don't need more confusion, IMHO.