i did a dist-upgrade on this install after completeing the install. after I rebooted and logged in, I saw this error.
ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: mate-panel 1.8.1+dfsg1-3
ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
Uname: Linux 3.19.0-10-generic i686
ApportVersion: 2.16.2-0ubuntu5
Architecture: i386
CurrentDesktop: MATE
Date: Sat Mar 28 18:44:07 2015
ExecutablePath: /usr/bin/mate-panel
InstallationDate: Installed on 2015-03-28 (0 days ago)
InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Beta i386 (20150326)
ProcCmdline: mate-panel
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB.UTF-8
SHELL=/bin/bash
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: mate-panel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1425341, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.