Unable to manage sieve scripts

[Alex]

Description: Ubuntu 15.10
Release: 15.10

kmail:
  Installed: 4:15.08.2-0ubuntu1
  Candidate: 4:15.08.2-0ubuntu1
  Version table:
 *** 4:15.08.2-0ubuntu1 0
        500 http://archive.alepot.mine.nu/ubuntu/ wily/universe amd64 Packages
        100 /var/lib/dpkg/status

I expect to be able to manage server-side sieve scripts from the 'Manage Scripts' dialog.
The manager logs on to the sieve server and data is returned.
The data is inaccessible because the dialog contents are greyed out.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: kmail 4:15.08.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
Uname: Linux 4.2.0-34-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Mar 16 18:05:19 2016
SourcePackage: kdepim
UpgradeStatus: No upgrade log present (probably fresh install)