If you have upgraded, or are just about to upgrade, to DNN 6, here are a few tips to make things go a bit smoother or, at least, save you tearing your hair out!
1. Do NOT upgrade without following the suggested upgrade path here
http://www.dotnetnuke.com/Resources..._Path.aspx 2. There is an issue with duplicate skins in /portals/_default/skins and /portals/#/skins that causes various problems, check out
http://www.dotnetnuke.com/Resources...posts.aspx 3. There is an issue with the z-index on some skins in DNN 6, check out
http://www.dotnetnuke.com/Resources...age/1.aspx 4. After upgrading, you will find the HTML editor acting strangely, you need to upload the new HTML Editor Manager that was left out of the upgrade in error and set the editor of choice (although the old FCK editor does not seem to work in DNN 6), you also get to configure the editor in the manager, check out
http://www.dotnetnuke.com/Resources...spx#424745 These are the main issues with the upgrade that I have found so far and I have linked to what I hope are the most informative posts on the subject.