I'm seeing a few issues in my tests with CC 2017. I'll work on those immediately and should have an update by early next week. In the mean time it is probably best to not upgrade if you want to use the webassist extensions.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.