On the latest installation of horde webmail (5.1.0 beta3), I’m not able to edit my user preferences.
I found the solution here; find and edit the file: ingo/lib/Api.php,
replace line 56:
return array(
with:
global $registry;
$pushed = $registry->pushApp('ingo');
$links = array(
hmm it still does not seem to save the email preferences… tried a similar edit on the imp/Api.php but still not saving prefs… grrr