Initial Issues With 5.0

I'm trying Unity 5 again now it's out of beta.

First issues.

I compiled the Sample Projects for Android, all seemed to go fine.
Loads on my device with the 2d platform scene, when I try to use the menu to change scene it crashes.
I've not gone into logcat yet.

I'm opening an old project, it's trying to upgrade the .dll files and has just totally locked up on one.
Going to have to end the process.

Any suggestions?

Edit: Upgrade seemed to go through after trying again,now just to see what it will take to make it run again.