Krischan,
First off, thank you for making such a worthwhile plugin. Like france1972 said, its being used my many, many people.
Having this issue with Wordpess 2.8 and get recent comments 2.0.6...
The comments do not automatically update themselves on the sidebar. The only way to get the comments to update is to go into plugin options and select "update recent comment options." You don't actually have to change anything, but it does re-fresh the most recent comments displayed. It's a pain to have to do it every day...
Any help would be great. Thanks!