The Twitter account @EvernoteHelps asked me to put in another ticket request. I did.
I supplied new sample .enex files and logs and got this nice note back:
Korben D. (Evernote Help and Learning)
Apr 14, 11:00
Thanks for your patience. I'll spare you the standard bug response since you're heard it all before. The issue is easily reproduced on our end 100% of the time, so there is no reason this shouldn't get some developer attention. I'm going to bring this up with the product manager to see if we can finally get this issue taken care of. Let me know if you have any questions or additional concerns you'd like me to take a look at.
Regards,
Korben
I installed EN 6 for Windows Desktop today, with high hopes it might solve this issue. Alas, it did not.
The search continues ...