I'm having exactlly the same problem - and we're not alone!
People in these threads (including this one) are struggling too!
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=23229
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=23703
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=23294
I've tried 5/6 different projects, each time using just an individual video file to test whats happening. In all cases you get to setp 2 and clicking on next does nothing - not a thing. You CAN click on the preview and it will preview your project, but again, clicking Next from there won't get you to step 3 either! I simply can't get to the step where I even have an option to burn

As pointed out elsewhere, it doesn't appear to hang, it simply ignores the fact that I've clicked on the button!
I've tried with an imported DVD, a self made MPEG 2 from a live HQ stream, a DIVX file etc etc...NONE of them work so I don't see how it can be the file type that's the issue when ALL files types are doing it
I've uninstalled and re-installed but no difference.
In all cases I'm using the plain and create new DVd function and I've trie a number of 'templates' to try and elimate them as the cause too.
PLEASE help!! The thought of using Nero ...well it doesn't bear thinking about
