As you noticed, DCSki's Message Forum software was upgraded recently from ubb.classic to ubb.threads. ubb.threads is the next-generation package by the same company that makes the software DCSki has used for over 5 years. ubb.threads is much faster and customizable, and stores all messages in a database, paving room for much flexibility in the future. Because ubb.threads has the same DNA as ubb.classic, it was possible to bring all existing 5,000+ messages along during the upgrade, which was important.
I've seen a couple rumblings about the new software on the message forum and also received feedback from someone via e-mail who didn't like the new software.
Although ubb.threads is highly customizable, I have not made any customizations yet. If people have specific complaints about the new software, there's a good chance I can address those complaints through customizations -- but I need your help focusing on true deficiencies vs. things that we're all still simply getting used to (and might grow to like).
One thing you should realize is that you can already customize many aspects of the message forum yourself -- with far greater options than in the past. When you login and go to "My Home", you'll see some links to the bottom to edit preferences. (You can even change your own sort order -- something people have debated about for years!) In particular, note the style sheet (skin) option. That lets you change the look of the message forum considerably, with around a dozen options right now.
I'm still getting familiar with the software, but one thing I've noticed that I do not like is the Search capability -- it just doesn't seem to be too good. So I'm already thinking about how I might improve that. Otherwise, I haven't come across much that I hate, but you all have been busier using the forums than I have.
Again, I'm trying to find fundamental flaws -- not necessarily personal dislikes that might change over time.