Hey The attached patch should fix this issue (tested on my machine, seems to work).
Could you try building the package with this patch applied and report back? cheers -- Stefan Ott http://www.ott.net/ "You are not Grey Squirrel?"
--- xfce4-mailwatch-plugin-1.1.0.orig/libmailwatch-core/mailwatch-mailbox-mbox.c 2008-09-11 06:31:50.000000000 +0200 +++ xfce4-mailwatch-plugin-1.1.0/libmailwatch-core/mailwatch-mailbox-mbox.c 2010-10-06 05:39:15.452009578 +0200 @@ -341,6 +341,8 @@ if( val == mbox->interval ) return; + mbox->interval = val; + if( g_atomic_int_get( &mbox->running ) ) { /* probably shouldn't do this so frequently */ if( mbox->check_id )