I have the dash blur bug which appears to be common to users of 13.04 with integrated intel graphics. https://bugs.launchpad.net/nux/+bug/1087534
In that bug report people suggest upgrading libnux-4.0.0 from the daily build PPA. I tried this and it fixes the problem. Is this a safe thing to do though or should I wait until the update is released to the main repository? I'm new to Ubuntu so have no idea how long that takes.