Please see here:
I've been troubled by this problem for a long time.
The post tell that : When you open a project, cakewalk / sonar platinum will try to lookup some zip file outside the project and try to extract it. If you encounter a damaged zip file or a zip file that takes a long time to extract, you will always get stuck in the "creating UI".
Because of conclusion in topic above, I remember that I created a huge zip file at "D:/mydata.zip" not long ago. Extracting it will take 20 minutes more.
And I opened any project in cakewalk and hang at "creating UI" for 20 minutes or more time .
I removed the D:/mydata.zip and all projects were loaded successfully and faster!
But why was the Cakewalk even trying to unzip a zipfile that is not in the content directory or the project folder?