I followed the instructions to update my notes in L3 first before importing, and then imported my "Early Church Fathers TOC" Note file. All the formatting got screwed up.
In L3, it's all organized nicely with headings and sub-headings for the different volumes (never-mind the font and line-spacing inconsistencies; that's the way it was when I got it and I haven't cared to clean it up). Here's pretty much how the Ante-Nicene Fathers TOC looks in L3:
http://www.scribd.com/doc/24848861?secret_password=fnrhckruu9vtc5uf036
But after importing into L4, it looks like this. (Note how several volumes, and the headings within them, are run together which were separate before):

The same sort of thing happens with the "Nicene & Post Nicene Fathers Series 1" and "Nicene & Post Nicene Fathers Series 1".
Here's the file I'm importing (I got it from Graham Owen who posted it here):
4035.Early Church Fathers TOC.zip
Interestingly, the file date still shows as 12/19/2009, even after running "Update Notes Now" in L3. Is that the problem? Did it not actually update them into some format that was readable into L4?
Let me know if you need me to attach my L4 notes.db file or anything.