I did run the deduplicator and have been using lastpass with good success since that time.
I have now noticed, however, that some of my KeePass entries were not correctly imported after all. I don't know if has something to do with the original problem I reported or something else, but here is the issue:
It appears that entries I had in KeePass which included something in the "Notes" section were imported to lastpass as a Secure Note _only_. The user/password info never got imported.
Is there anything I can do about this? I really don't want to go back and review every entry manually ...
And I don't want to start over, because lastpass now has the latest information and updates.