Sorry it's taken me a day to respond - I wanted to give this newest fix a little time to see if it was going to work. Unfortunately, after no trouble yesterday, the warning pop-ups for URL:Mal from chrome.exe directing to ninthclub(dot)com have returned. I followed your directions about uninstalling Chrome, running the fix you provided, then reinstalling Chrome as provided, with a couple of caveats: when I go to Google Sync, I don't see a "Stop and Clear" button, but instead a button that says "Reset Sync" - I clicked that. Then, when uninstalling Chrome, I don't see an option about user data or settings, but instead a box that says "Also delete your browsing data" - I clicked that, as well.
Attached is the log after running the fix yesterday (after uninstalling Chrome), as well as my FRST logs from this morning after the problem returned (after reinstalling Chrome yesterday).
Thanks again - this is turning out to be a persistent little sh!t.