Starting pantheon files with gksudo resulted in the attached screen.
ProblemType: Bug
DistroRelease: elementary OS 0.2
Package: elementary-desktop 1.289-0~363~precise1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: Ubuntu 3.2.0-35.55-generic 3.2.34
Uname: Linux 3.2.0-35-generic x86_64
ApportVersion: 2.0.1-0ubuntu15+elementary3~precise1
Architecture: amd64
CrashDB: elementary_meta
Date: Tue Jan 1 15:43:58 2013
InstallationMedia: elementary OS 0.2 "Luna" - Beta 1 amd64 (20121114)
MarkForUpload: True
ProcEnviron:
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: elementary-meta
SuspiciousXErrors:
ThirdParty: True
UpgradeStatus: No upgrade log present (probably fresh install)
By the way, it says "Files is not your default file manager" "Set as default" "ignore"