I had loaded an NZB and was using command "Download&save attachments" and had hit *YES* to "Do you want to delete headers&bodies after successful save attachments?"
It seems that UE does not notice when my internet connection is lost and blindly keeps trying to download articles/rars when there is no internet connection, apparently (wrongly) assumes that the articles are missing on the server, and skips over these articles when connection is lost - but when connection returns it does not go back and look for articles that were skipped. (other software appliations such as NetMeter pop up a warning cloud whenever the computer disconnects from the internet -- maybe UE could do the same, and pause downloading until connection returns?)
I am using a wireless connection that disconnects often, and whenever this happens, Usenet Explorer will truncate the rar files currently downloading, skip the next few on the list, then continue with the last-part of a rar when the connection returns. Setting only one "task" greatly reduces the number of incompletes (as expected), so for every disconnect/reconnect cycle will typically result in two incomplete rars (and it seems several skipped rars) - or so it seems.
Here is what the results looked like (there are 75 rars in the set, the remainder [not shown] were the correct 48,829KB size) and too much is missing to restore with Par2's.

Two questions:
1. How can I set up UE so that the occasional WI-FI disconnects do not result in incompletes?
2. Is there an easy way to restore the missing articles in the partial rar files without downloading the entire (50MB) article-set/rar-file again?
Thanks