If I had to venture a guess, it was more of an issue with mNotes than anything else. Their installer is somewhat flaky and has been for a few versions. It works fine, but I've seen it freak out like this before, and once it's freaked there's not a lot you can do.
I found mNotes rock solid once you get it installed, but until you got it completely configured it was a sit back and pray kind of thing ... ok that and I don't trust Lotus Notes.
