I've been having this weird problem since upgrading from version 5 to version 6: Almost always when doubling-clicking on a group or group-of-groups, random and usually recent old posts (i.e., already downloaded or marked as old) show up. Sometimes re-selecting "Hide Old" from the drop-down helps, but they'll show up again when I re-enter the group. Deleting the posts via Shift-DEL does always work, but I hate to do that because that means they'll never show up in the future when I do a local search. Is this a known issue? I really feel like this is a bug, because if I tell the program to mark something as old, I shouldn't see it if "Hide Old" is selected.
A couple of other observations:
* Sorting by Status is very buggy. It simply doesn't work right. Try it.
* In version 5, if a post was in "Failed Download" status (because, let's say, it hit the duplicate detector), and you forced a re-download via "Download - Bypass Filters," the status would change to "Downloaded." In version 6, it will stay in "Failed Download" status. I consider this to be a bug as well.
* I usually sort by subject. Sometimes this messes up when I enter a group because it's still downloading headers after the list of posts is displayed. I have to wait a few seconds and manually click the Subject header twice to get a proper sort.