GOOD NEWS #2
I have had the same challenge since I installed 4.07. The only way I could delete not just 1 but sometimes 3, 10, 14 persistent cookies was to go into my Google Chrome settings and delete history for the past week. Most irksome!
However, reading PeeVees comment above, I went ahead and downloaded version 4.08.4428, and VOILÀ! .... persistent cookies disappear!
Thank you!