Hi,

Doesn't your problem apply to this case?  I tried using unpatched
Gnus v5.11 for a couple of these days to read and post mail and news
articles as usual, however I didn't encounter any other trouble.

>>>>> Katsumi Yamaoka wrote:

> The prerequisites to cause this bug are:

> 1. You have persistent (i.e., cached, marked with `*') articles
>    that you have read (or marked as ticked) in a group.

> 2. Some or all of those articles have been expired in the server.

> 3. You have ever performed `gnus-agent-expire' or
>    `gnus-agent-regenerate', or have ever simply deleted the
>    ~/News/agent/ directory.  (In the last case, the directory
>    and files are regenerated automatically.)

> In that case, some or all of persistent articles that have been
> expired in the server are recognized as unfetched articles,
> because the Agent cannot fetch those headers from the server.
> And then, they are all marked as unread when you run the `c'
> command (`gnus-summary-catchup-and-exit'), that recognizes
> unfetched articles as unread articles.

[...]

> The patch for Gnus v5.11 is here: