I believe this version fixes saving in KeePass (https://bugzilla.xamarin.com/show_bug.cgi?id=28777).
I added 4.0.5.1, please bump to 4.2
commit 228994031585879b17b90ac6659e5cb80214d088 Author: Heather Cynede <cynede@gentoo.org> Date: Thu Dec 10 12:04:32 2015 +0400 dev-lang/mono: bump to 4.2.1.124, patch for bug 36724 Package-Manager: portage-2.2.26 commit a72ff4da91225f1a0281332fc157b39ced22e9ba Author: Heather Cynede <cynede@gentoo.org> Date: Wed Dec 9 12:44:30 2015 +0400 dev-lang/mono: bump to 4.2.1.102, fix GitExtensions issue Package-Manager: portage-2.2.26