So, over the past couple of days I did a fresh install of Roundcube Webmail (0.3.1) following a pretty good tutorial. Everything installed fine and all my configurations were assumed to be correct, other than Roundcube wouldn't download folders! So no Drafts, Sent, Junk or Trash..
After going through the Roundcube forums looking for an explanation, I found the following two way's to fix the problem. Begin with the first method and if it doesn't work, try the second. Firstly, you'll need to open up your main.inc.php file from the config directory of where Roundcube is installed.
Now find the following line:
$rcmail_config['protect_default_folders'] = TRUE;
and change the value to false;
$rcmail_config['protect_default_folders'] = FALSE;
You should now be able to subscribe to all of you folders under Personal Settings. If however this doesn't work, please try the next method.
Find the following line:
$rcmail_config['drafts_mbox'] = 'Drafts';
and change it to this:
$rcmail_config['drafts_mbox'] = 'INBOX.Drafts';
You will then need to repeat this step for all the folders (Sent, Junk & Trash). They should be directly under Drafts in the same file.
If both of these methods fail, please head over to the Roundcube Forums where someone should be able to help you out!