That option is not checked. I guess I should have posted sooner when I remembered either A) unchecking it, or B) seeing it wasn't checked and being confused, because I'm certain I did one of the two. To be more specific about my configuration on that tab, in case this turns out to be a problem with my config or a bug:
Disable AutoPAR - Not Checked
Send PARS to Wish List - Not Checked
Automatically UnRAR Complete Files - Not Checked
Remove repaired but, not unrared sets in the download list - Not Checked
Delete RARs and PARS on successful UnRAR. - Checked (the files aren't being deleted, which is good since shouldn't be in this scenario)
Pause PARS and only download the ones needed for Repair. - Checked (this works right, and was working right before the problem started, except that before the problem started, the downloads would always go into retrying mode where the retry counter would countdown and then I don't know if any action was taken at the end of the coundown or if the retry counter just counted up, making the next countdown longer. Regardless, I would pause the downloads when I saw this to stop the retry counter)
Aggressive Assembly mode (bypass retries and assemble when you have enough PARs) - Checked (maybe this is a new option, since it wouldn't apply while the pause option is checked, I will try unchecking it. Don't assume a failure to remember to post back means the issue was solved.)
ETA: I actually had one set I wanted to download. Unchecking Aggressive Assembly mode made no change in the behavior. I am checking it again, but I am not sure what other options to change. Delete RARs and PARS on successful UnRAR might be the most logical when thinking about how software might misbehave, so I may try to find another set and test that unchecked. On a side note, I also checked Help just in case. The screenshot on this page:
http://help.newsbin.com/index.php/V600- ... AR_Options is nothing like what my screen looks like. Specifically, all of the options I listed are in one box with only "Send PARs..." and "Remove repaired..." indented. There is a second box, but it is just for "Enable Post UnRAR Filter" and a filter drop down. Again, this seems like something I recall noticing before, so perhaps I should have posted sooner so I could have included that in the OP.
ETA2: Unchecking Delete RARs and PARS on successful UnRAR did not make a difference, either. I am out of time for now, but I'd definitely appreciate additional feedback regardless of whether I'm doing something wrong or experiencing a bug.