display arrangement doesn't work

i'm using Loki beta.
the bug is in useless 'Apply' button in settings, when i try to shift my right monitor little bit higher than the left one it changes nothing.

ProblemType: Bug
DistroRelease: elementary 0.4
Package: elementary-desktop 1.413+468~daily~ubuntu0.4.1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CrashDB: elementary_meta
CurrentDesktop: Pantheon
Date: Mon Jul 4 11:46:59 2016
InstallationDate: Installed on 2016-07-04 (0 days ago)
InstallationMedia: elementary OS 0.4 "Loki" - Daily amd64 (20160613)
SourcePackage: elementary-meta
SuspiciousXErrors:

ThirdParty: True
UpgradeStatus: No upgrade log present (probably fresh install)

Launchpad Details: [#LP1598744](https://bugs.launchpad.net/bugs/1598744) Artemic - 2016-07-04 08:53:37 +0000

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