Setting 'Send automatic reply' or change alias results in looping error page

Version 1.450, in Virtual min if I try to change an automatic reply I'm served an empty (albeit loading) page with 'error' in the title. Nothing happens, and the alias/autoreply isn't set.

Related forumpost: http://www.virtualmin.com/forums/virtualmin/re%3achanging-email-settings-results-in-error.html

Status: 
Closed (fixed)