I recently switched to self-hosted StatusNet installation from identi.ca. One of the issues I was having was not getting status updates from all the users I was subscribd to. Thanks to the helpful people at !feds group, I was able to solve the problem, if you have a similar issue, you can fix it by running (from statusnet folder):

plugins/OStatus/scripts/resub-feed.php -u <atom feed of the person you are subscribed to>

and then

plugins/OStatus/scripts/resub-feed.php <atom feed of the person you are subscribed to>

 

(first you have to run it with -u switch, and then run it without -u switch).
For StatusNet, link for atom feed can be obtained from user’s profile page, below the list of following and followers.