Hello,
 
I've recently setup Roundcube, and it feels great, fine work!  I'm using BincIMAP and/or Dovecot (both which show the same problem).  The problem being when I try to enter a folder in Roundcube with 2k+ messages it doesn't not show messages in the given folder.  Sometimes leaving and reentering that folder will display a list of emails, but most of the time not.
 
Running an strace on binc I see it reading the requested directory for files and parsing those files for details.  Before it completes Roundcube returns with an empty "mailbox", and the "Loading" message disappears from the top of the browser.
 
I noticed some AlohaMail IMAP code being used, and don't remember having this problem with that MUA, but that was quite a while ago, with a far different setup.
 
Server:
Roundcube (20051021), Linux 2.6, MySQL 5.0.15, BincIMAP 1.2.13final (Maildir++) on JFS (without Auth or SSL), Apache 2.0.55 w/PHP 5.0.4
 
Client:
Windows XP, Firefox 1.5rc3 (though the problem is seen on Firefox 1.0.x, and IE 6)
 
Any help would be appreciated, and let me know if you'd like any further details.
 
Thanks,
Ethan