Deleting Grouplists seemed to help at first, but I ended up re-creating them laboriously 3 or 4 times, in addition to a complete uninstall and reinstall of the product. There also appears to be a problem on some users' machines where PMINews will crash with a SYS3175 error as it goes to retrieve new headers from the server. Likewise, there doesn't appear to be a way to limit the number of newsgroup headers downloaded at one time. And there are many other places where the v1.0 copy of PMINews I tested just doesn't feel finished. Plus, anything you add to the dictionary will not be recognized until the next message you compose.
Key bindings feel awkward too.
While EmTec newsreader will let you advance back and forth through articles using 'N' and 'P' for Next and Previous respectively, PMINews uses F7 and F6 instead. Not great choices in my opinion. I should stress that not everyone who uses PMINews has experienced all these major difficulties, but a considerable number have. Checking the newsgroups themselves, especially comp.os.os2.mail-news, reveals a number of people who are having these same problems trying to get this program to work. I spent a long time checking my own configuration and corresponding with other users to make sure I wasn't stepping out over a cliff that had no bridge but, in short, I believe PMINews needs its stability problems addressed quickly by both Stardock and Southside Software before I can seriously recommend buying it.