This is the case:
Frontend users have publisher rights in specific categories. They have total access to all articles in these categories: add, edit, edit other users articles and publish.
When they use the author alias feature to use an author that's not a user in the website, they loose the possiblity to edit the article. It doesn't matter whether it's a published or an unpublished article, the article is gone from "My Page".
Is it a bug or something local? I use Joomla 1.5.18 and K2 2.2
Note: I really like K2 but I have come across several serious matters that concern the author alias feature. I am close to go online with a website that will have 5-6 different frontend editors and I almost doubt with I can use K2.